How will you differentiate between a convex and a concave lens by looking at a printed page?
Question types
Refraction through a Lens question types
204 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
204
Questions
7
Question groups
5
Question types
01
[1 Mark Question Answer]
49 Q→02[2 Mark Question Answer]
28 Q→03[3 Mark Question Answer]
44 Q→04[5 Mark Question Answer]
13 Q→05TRUE / FALSE
5 Q→06MCQ
54 Q→07fill in the blanks.
11 Q→Sample Questions
Refraction through a Lens questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
View full solution →
How will you differentiate between a convex and a concave lens by looking at a distant object.
A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. Find : the nature of image.
How does the power of a lens change is its focal length is doubled?
How is the power of a lens related to its focal length?
What is magnifying glass? State its two uses.
A convex lens forms an inverted image of size same as that of the object which is placed at a distance 60 cm in front of the lens. Find : The focal length of the lens
A convex lens forms an inverted image of size same as that of the object which is placed at a distance $60$ cm in front of the lens. Find: The position of image
View full solution →An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. find: the magnification of image.
A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on other side of it. Find the name the kind of lens.
State two applications each of a convex lens and concave lens.
Define magnifying power of a simple microscope. How can it be increased?
Where is the object placed in reference to the principal focus of a magnifying glass, so as to see its enlarged image? Where is the image obtained?
Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.
An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. find : the position of image.
Describe how you would determine the focal length of a converging lens, using plane mirror and one pin. Draw a ray diagram to illustrate your answer.
The following diagram shows the experimental set up for the determination of focal length of a lens using a plane mirror.
(i) draw two rays from the point O of the object to show the formation of image I at O itself.
(ii) What is the size of the image I?
(iii)State two more characteristics of the image I.
(iv) Name the distance of the objects O from the optical centre of the lens.
(v) To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens ?
(i) draw two rays from the point O of the object to show the formation of image I at O itself.
(ii) What is the size of the image I?
(iii)State two more characteristics of the image I.
(iv) Name the distance of the objects O from the optical centre of the lens.
(v) To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens ?
Describe in brief how would you determine the approximate focal length of a convex lens.
An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of object on a screen placed at distance 75 cm from the lens . Find: (i) the focal length of lens, and (ii) the magnification.
Describe how you would determine the focal length of a converging lens, using a plane mirror and one pin. Draw a ray diagram to illustrate your answer.
A concave lens forms a magnified or diminished image depending on the distance of object from it.
A ray of light incident at the optical centre of lens, passes undeviated after refraction.
A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.
A concave lens, if kept at a proper distance from an object, can form its real image.
A convex lens has a divergent action and a concave lens has a convergent action.
The maximum magnifying power of a convex lens of focal length 5 cm can be : ________ .
- A25
- B10
- C1
- ✓6
Answer: D.
View full solution →A magnifying glass forms : ________ .
- AA real and diminished image
- BA real and magnified image
- ✓A virtual and magnified image
- DA virtual and diminished image
Answer: C.
View full solution →The power of a lens is + 1.0 D is : ________ .
- Aconvex of focal length 1.0 cm
- ✓convex of focal length 1.0 m
- Cconcave of focal length 1.0 cm
- Dconcave of focal length 1.0 m
Answer: B.
View full solution →On reducing the focal length of a lens, its power : ________ .
- ADecreases
- ✓Increases
- CDoes not change
- DFirst increases then decreases
Answer: B.
View full solution →The correct lens formula is : ________ .
- A$\frac{1}{ u }+\frac{1}{ v }=\frac{1}{ f }$
- B$\frac{1}{ u }-\frac{1}{ v }=\frac{1}{ f }$
- ✓$\frac{1}{ v }-\frac{1}{ u }=\frac{1}{ f }$
- D$f=\frac{u+v}{u v}$
Answer: C.
View full solution →An object is placed at a distance 5 cm from a convex lens of focal length 10 cm. The image formed is virtual, upright and ________ .
An object is placed at a distance 2f from a convex lens of focal length f. The size of image formed is ________ that of the object.
An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ________ .
The focal length of a then convex lens is ________ than that of a thick convex lens.
A convex lens is placed in water. Its focal length will ________ .
Generate a Refraction through a Lens paper free
Pick question groups from the list above, set marks and difficulty, and export a branded PDF with step-by-step answer keys. First 3 chapters free — no signup.