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Light – Reflection and Refraction Science - Light – Reflection and Refraction

UP Board (UPMSP) - STD 10 - Science (UPMSP - English Medium). 971 questions in this chapter.

Question types

Light – Reflection and Refraction question types

971 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

971
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9
Question groups
5
Question types
Sample Questions

Light – Reflection and Refraction questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q1 Mark
When light enters the atmosphere it strikes on extremely fine particles, which deflect the rays of light in all possible directions, This is due to -
  • A
    reflection of light
  • B
    atmospheric refraction
  • ✓
    scattering of light
  • D
    dispersion of light

Answer: C.

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Q 2M.C.Q1 Mark
An object is placed in front of a convex mirror. Its image is formed :
  • A
    at a distance equal to the object distance in front of the mirror.
  • B
    at twice the distance of the object in front of the mirror.
  • C
    half the distance of the object in front of the mirror.
  • ✓
    behind the mirror and it's position varies according to the object distance.

Answer: D.

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Q 3M.C.Q1 Mark
Study the given ray diagrams and select the correct statement from the following :
  • A
    Device $X$ is a concave mirror and device $Y$ is a convex lens, whose focal lengths are $20 \ cm$ and $25 \ cm $ respectively.
  • B
    Device $X$ is a convex lens and device $Y$ is a concave mirror, whose focal lengths are $10 \ cm$ and $25 \ cm $ respectively.
  • C
    Device $X$ is a concave lens and device $Y$ is a convex mirror, whose focal lengths are $20 \ cm$ and $25 \ cm$ respectively.
  • ✓
    Device $X$ is a convex lens and device $Y$ is a concave mirror, whose focal lengths are $20 \ cm$ and $25 \ cm$ respectively.

Answer: D.

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Q 4M.C.Q1 Mark
Study the following ray diagram : In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by.
  • A
    $\ce{y, p, z}$
  • B
    $\ce{x, q, z}$
  • ✓
    $\ce{p, y, z}$
  • D
    $\ce{p, z, y}$

Answer: C.

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Q 5M.C.Q1 Mark
A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence refraction $(\angle\text{i}).$ He then measures the corresponding values of the angle of refraction $(\angle\text{r}) $ and the angle of emergence $(\angle\text{e})$ for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be.
  • A
    $\angle\text{i} > \angle\text{r} > \angle\text{e}$
  • ✓
    $\angle\text{i}=\angle\text{e} > \angle\text{r}$
  • C
    $\angle\text{i} < \angle\text{r} < \angle\text{e}$
  • D
    $\angle\text{i}=\angle\text{e} < \angle\text{r}$

Answer: B.

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Q 6Assertion - Reasoning (1 Marks)1 Mark
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : In the case of concave mirror, the minimum distance between real object and its real image is zero.
Reason : If concave mirror forms virtual image of real object, the image is magnified.
  • A
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • ✓
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.

Answer: B.

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Q 7Assertion - Reasoning (1 Marks)1 Mark
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Light is able to reach earth from the sun.
Reason : Light rays can travel in vaccum.
  • ✓
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.

Answer: A.

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Q 8Assertion - Reasoning (1 Marks)1 Mark
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : We can decide the nature of a mirror by observing the size of erect image in the mirror.
Reason : The minimum distance between a real object and its real image in a concave mirror is non zero.
  • A
    Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true but $R$ is false.
  • ✓
    $A$ is false but $R$ is true.

Answer: D.

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Q 9Assertion - Reasoning (1 Marks)1 Mark
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : A plane mirror neither converges parallel rays of light nor diverges them.
Reason : The focal length of a plane mirror can be considered to be infinite.
  • ✓
    Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.

Answer: A.

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Q 10Assertion - Reasoning (1 Marks)1 Mark
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : A convex lens is made of two different materials. A point object is placed on the principal axis. The number of images formed by the lens will be two.
Reason : The image formed by convex lens is always virtual.
  • A
    Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of the assertion.
  • ✓
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.

Answer: C.

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Q 17True-False1 Mark
Both concave and convex mirror send the reflected light at the same angle as the angle of incidence on the other side of the principal axis. [True/ False]
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Q 18True-False1 Mark
A convex mirror of focal length 'f' produces an image $\frac{1}{\text{m}}$ of the size of object, then object distance is (m - 1)f numerically. [True/ False]
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Q 26[2 Mark Questions]2 Marks
The refractive indices of three media are given below :
MediumRefractive Index
A1.6
B1.8
C1.5
A ray of light is travelling from $A$ to $B$ and another ray is travelling from $B$ to $C$.
(a) In which of the two cases the refracted ray bends towards the normal?
(b) In which case does the speed of light increase in the second medium?
Give reasons for your answer.
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Q 27[2 Mark Questions]2 Marks
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
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Q 28[2 Mark Questions]2 Marks
A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
  1. In which direction does he move the lens to focus the flame on the screen?
  2. What happens to the size of the image of the flame formed on the screen?
  3. What difference is seen in the intensity (brightness) of the image of the flame on the screen?
  4. What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
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Q 29[2 Mark Questions]2 Marks
The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. If speed of light in glass is 2×108 m/s, find the speed of light in water.
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Q 30[2 Mark Questions]2 Marks
Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.
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Q 31[3 Mark Questions]3 Marks
(i) Explain why the refractive index of any material with respect to air is always greater 1 .
(ii) In the figure below a light ray travels from air into the semi-circular plastic block. Give a reason why the ray does not deviate at the semi-circular boundary of the plastic block.
Image
(iii) Complete the ray diagram of the above scenario when the light ray comes out of the plastic block from the top flat end.
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Q 32[3 Mark Questions]3 Marks
‘‘A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it.’’ State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the diagram.
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Q 33[3 Mark Questions]3 Marks
The image formed by a spherical mirror is real, inverted and is of magnification - 2. If the image is at a distance of 30 cm from the mirror, where is the object placed ? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror.
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Q 34[3 Mark Questions]3 Marks
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image formed using the lens formula.
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Q 35[3 Mark Questions]3 Marks
A student wants to project the image of a candle flame on a screen 90 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole.
  1. Suggest the type of mirror he should use.
  2. Determine the linear magnification in this case.
  3. Find the distance between the object and its image.
  4. Draw ray diagram to show the image formation in this case.
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Q 36[5 marks Questions]5 Marks
A $10 cm$ long pencil is placed $5 cm$ in front of a concave mirror having a radius of curvature of $40 cm$.
(i) Determine the position of the image formed by this mirror.
(ii) What is the size of the image?
(iii) Draw a ray diagram to show the formation of the image as mentioned in the part (i).
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Q 37[5 marks Questions]5 Marks

Image
The above image shows a thin lens of focal length $5 m$.
(i) What is the kind of lens shown in the above figure?
(ii) If a real inverted image is to be formed by this lens at a distance of $7 m$ from the pole, then show with calculation where should the object be placed?
(iii) Draw a neatly labelled diagram of the image formation mentioned in (ii)

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Q 38[5 marks Questions]5 Marks
  1. Define focal length of a divergent lens.
  2. A divergent lens of focal length 30 cm forms the image of an object of size 6 cm on the same side as the object at a distance of 15 cm from its optical centre. Use lens formula to determine the distance of the object from the lens and the size of the image formed.
  3. Draw a ray diagram to show the formation of image in the above situation.
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Q 39[5 marks Questions]5 Marks
What is meant by power of a lens? Define its S.I. unit. You have two lenses A and B of focal lengths +10 cm and –10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.
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Q 40[5 marks Questions]5 Marks
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer.
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image.
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Q 41case /data -based (4 Marks)4 Marks
Mr. Rakesh was helping her daughter Aruna at home understanding about the basics of reflection of light. He found the simplest way to convey the role of curved mirrors using stainless steel teaspoon. Aruna got surprised to know that virtual image is that which can be seen but cannot be obtained on the screen. Mr. Rakesh then explained the formation of image using Ray diagrams.
(i) What do you mean by reflection of light?
(ii) The angle between incident ray and reflected ray is $60^{\circ}$. What is the value of angle of incidence?
(iii) A ray of light is incident on a plane mirror at an angle of $30^{\circ}$. what is the angle of reflection?
or
(iv) What happens to a light ray that is incident normally on a surface?
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Q 42case /data -based (4 Marks)4 Marks
Study the following table for a convex lens for different positions of object and answer the following questions:
Position of objectPosition of imageRelative size of image
At infinityAt focus F_(2)Highly diminished point sized
Beyond 2F_(1)Between F_(2) and 2F_(2)Diminished
At 2F_(1)At 2F_(2)Same size
Between F_(1) and 2F_(1)Beyond 2F_(2)Enlarged
At focus F_(1)At infinityInfinitely large or highly enlarged
Between focus F_(1) and optical centre OOn the same side of the lens as the objectEnlarged

(i) What is the nature of the image, if an object is placed at infinity ?
(ii) Identify the nature of the image for which the object is between focus and optical centre.
(iii) What is position of image, when object is place at focus $\left(f_1\right)$ ?
or
(iv) What is the focal length of a lens for an object placed $50 cm$ from the lens producing virtual image at a distance of $10 cm$ in front of the lens?

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Q 43case /data -based (4 Marks)4 Marks
Is there a relationship between the radius of curvature $R$, and focal length $f$, of a spherical mirror ? For spherical mirrors of small apertures, the radius of curvature is found to be equal to twice the focal length. We put this as $R=2 f$. This implies that the principal focus of a spherical mirror lies midway between the pole and centre of curvature.
(i) Write relation between radius of curvature and focal length.
(ii) For which type of mirrors above relation is verified?
(iii) What should be size of the aperture?
or
(iv) Where is the principle focus of a spherical mirror lies?
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Q 44case /data -based (4 Marks)4 Marks
"Change in path of a light ray as it passes from one medium to another medium is called refraction of light."

When light travels from a rarer medium to a denser one, it bends towards the normal $(i>r)$ and when travels from a denser medium to a rarer one. it bends away from the normal $(i<r)$.
Where, $\quad i=$ Angle of incidence
and $\quad r=$ Angle of refraction
We can see refraction in our daily life, some of the examples are given below :
The bottom of a tank or pond containing water appears to be raised due to refraction of light which takes place when light rays pass from the pool of water into the air. The letters appear to be raised when viewed through a glass slab placed over the document because of refraction of light.
When a light ray enters in a glass slab, then the emergent ray is parallel to the incident ray but it is shifted sideward slightly.
In this case, refraction takes place twice, first when ray enters glass slab from air and second when exits from glass slab to air.
(i) What do you mean by optically rarer and denser medium ?
(ii) What is the cause of refraction?
(iii) Draw a ray diagram shotving refraction through a glass slab.
or
(iv) Give one example of refraction from our daily life experience other than the two examples given above.

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Q 45case /data -based (4 Marks)4 Marks
When light ray goes from one transparent medium to another transparent medium, it suffers a change in direction, into second medium. The extent of the change in direction suffered by the phenomenon of change in the path of light rays when going from one medium to another medium is known as refraction. Ray is a given pair of media can be expressed in terms of refractive index. The refractive index is related to an important physical quantity in the relative speed of light in different media.

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(i) A ray of light enters into the glass from air. Does it bend towards normal ?
(ii) What is the unit of refractive index?
(iii) Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is $3 \times 10^3 ms ^{-1}$.
or
(iii) When light goes from one medium to another, which of the three parameters, frequency, wavelength, velocity change?

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