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Refraction of Refraction Science - Refraction of Refraction

UP Board (UPMSP) - STD 10 - Science (UPMSP - English Medium). 284 questions in this chapter.

Question types

Refraction of Refraction question types

284 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

284
Questions
6
Question groups
5
Question types
Sample Questions

Refraction of 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
A convex lens has a focal length of 10cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?
  • ✓
    15cm
  • B
    7cm
  • C
    20cm
  • D
    25cm

Answer: A.

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Q 2M.C.Q1 Mark
A lens of focal length 12cm forms an erect image three times the size of the object. The distance between the object and image is:
  • A
    8cm
  • ✓
    16cm
  • C
    24cm
  • D
    36cm

Answer: B.

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Q 3M.C.Q1 Mark
An object is 0.09m from a magnifying lens and the image is formed 36cm from the lens. The magnification produced is:
  • A
    0.4
  • B
    1.4
  • ✓
    4.0
  • D
    4.5

Answer: C.

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Q 4M.C.Q1 Mark
The power of a converging lens is 4.5D and that of a diverging lens is 3D. The power of this combination of lenses placed close together is:
  • A
    +1.5D
  • B
    +7.5D
  • C
    -7.5D
  • ✓
    -1.5D

Answer: D.

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Q 5M.C.Q1 Mark
Only one of the following applies to a concave lens. This is:
  • A
    Focal length is positive.
  • B
    Image distance can be positive or negative.
  • C
    Height of image can be positive or negative.
  • ✓
    Image distance is always negative.

Answer: D.

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Q 7Fill in the blank1 Mark
Fill in the following blanks with suitable word:
Lenses refract light to form images, a _________ lens can form both real and virtual images, but a diverging lens forms only ________ images.
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Q 9Fill in the blank1 Mark
Fill in the following blanks with suitable words:
The reciprocal of the focal length in metres gives you the _____________ of the lens, which is measured in _____________.
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Q 10Fill in the blank1 Mark
Fill in the following blank with a suitable word:
When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ___________ of the material.
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Q 19[2 Mark Questions]2 Marks
An object is placed at the following distance from a convex lens of focal length 15cm:
  1. 35cm
  2. 30cm
  3. 20cm
  4. 10cm
Which position of the object will produce:
  1. A magnified real image?
  2. A magnified virtual image?
  3. A diminished real image?
  4. An image of same size as the object?
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Q 23[3 Mark Questions]3 Marks
A concave lens has focal length 15cm. At what distance should the object from the lens be placed so that it forms an image at 10cm from the lens? Also find the magnification produced by the lens.
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Q 25[3 Mark Questions]3 Marks
The optical prescription for a pair of spectacles is:
Right eye: 3.50D, Left eye: 4.00D
  1. Are these lenses thinner at the middle or at the edges?
  2. Which lens has a greater focal length?
  3. Which is the weaker eye?
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Q 26[5 marks Questions]5 Marks
The speed of light in vacuum and in two different glasses is given in the table below:
Medium
Speed of light
Vacuum
Flint glass
Crown glass
$3.00 \times 10^8 m / s$
$1.86 \times 10^8 m / s$
$1.97 \times 10^8 m / s$
  1. Calculate the absolute refractive indexes of flint glass and crown glass.
  2. Calculate the relative refractive index for light going from crown glass to flint glass.
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Q 27[5 marks Questions]5 Marks
An object is placed 10cm from a lens of focal length 5cm. Draw the ray diagrams to show the formation of image if the lens is:
  1. Converging, and
  2. Diverging.
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Q 29[5 marks Questions]5 Marks
An object placed 4cm in front of a converging lens produces a real image 12cm from the lens.
  1. What is the magnification of the image?
  2. What is the focal length of the lens?
  3. Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.
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Q 30[5 marks Questions]5 Marks
The speed of light in air is $3 \times 10^8 m / s$. In medium $X$ its speed is $2 \times 10^8 m / s$ and in medium $Y$ the speed of light is $2.5 \times 10^8 m / s$. Calculate:
a. air ${ }^n x$
b. air ${ }^n y$
c. $X^n y$
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