Refraction through a Lens

Appeared in 10 of the 11 available papers.

Examined in

10 of 11 papers

Appears almost every year — treat as core

Typically worth

6.4 marks

Average per paper it appears in · 64 marks in total

Usual form

Short answer

44% of this chapter's 45 questions

Needs a diagram

16%

7 questions carry a figure — practise drawing them

Question-type distribution

Short answer20
MCQ10
Numerical7
Diagram5
True/False1
Reasoning1
Identification1

Most frequent topics

Lenses and image formation 28Magnification by a concave lens 2Speed of coloured light 1Concave lens image 1Partial covering of a lens 1Lens formula 1Reading glass 1Concave lens and magnification 1

Print:Questions only Questions + answers Answers only

Print chapter question bank

Showing 25 of 45 matching questions (64 marks).

25 questions

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(vii)2026

MCQEasy1 mark

The distance (V) of a virtual image formed by a lens of focal length 15 cm never exceeds a certain finite value, then this value will be: (a) less than 15 cm (b) between 15 cm to 30 cm (c) less than or equal to 30 cm (d) less than or equal to 15 cm

3(i)

The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens.

3(i)(a)2026

IdentificationEasy1 mark

Identify the type of lens used.

3(i)(b)2026

Short answerEasy1 mark

What would be the magnification (more than 1 / less than 1 / equal to 1) if the object is placed between F and 2F of the above lens?

5(i)2026

NumericalModerate3 marks

An object placed in front of a convex lens, forms an image of same size on a screen. Moving the object 12 cm closer to the lens results in the formation of a real image which is three times the size of the object. Calculate the focal length of the lens.

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(vii)2025

MCQEasy1 mark

For a real image formed by a convex lens, the ratio of I : O = 2 : 5, then the object is: (I is the height of the image and O is the height of the object) (a) between O and F (b) beyond 2F (c) at F (d) between F and 2F

4(iii)(a)2025

DiagramModerate3 marks

An object is placed at 2F position of a convex lens. Draw a ray diagram showing the formation of the image.

4(iii)(b)2025

Short answerModerate1 mark

How will the size of the image change if we, ONLY replace the lens in the above arrangement with another lens of a greater focal length?

5(i)2025

NumericalModerate3 marks

An object is placed in front of a concave lens at a distance of 45 cm from it. If its image is formed at a distance of 30 cm from the lens, calculate the focal length of the lens.

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(xii)2024

MCQEasy1 mark

Linear magnification(m) produced by a concave lens is : (a) m < 1 (b) m > 1 (c) m = 1 (d) m = 2

3(i)(a)2024

Short answerEasy1 mark

In a reading glass what is the position of the object with respect to the convex lens used?

3(i)(b)2024

ReasoningModerate1 mark

Why can we not use concave lens for the same purpose?

4(i)2024

NumericalModerate3 marks

The image of a candle flame placed at a distance of 36 cm from a spherical lens, is formed on a screen placed at a distance of 72 cm from the lens. Calculate the focal length of the lens and its power.

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(v)2023

MCQEasy1 mark

Speed of blue light in water is: (a) more than green light (b) more than orange light (c) more than violet light (d) more than red light

1(vi)2023

MCQEasy1 mark

A concave lens produces only ............... image. (a) real, enlarged (b) virtual, enlarged (c) virtual, diminished (d) real, diminished

3(i)(a)2023

True/FalseEasy1 mark

Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.

3(i)(b)2023

Short answerEasy1 mark

What will happen to the focal length of the lens if a part of the lens is covered with an opaque paper?

5(i)2023

NumericalModerate3 marks

A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from the lens should an object be placed so as to obtain a real image on the screen?

Select the correct option for each of the following questions

32021

MCQEasy1 mark

An object of height 10 cm is placed in front of a concave lens of focal length 20 cm at a distance 25 cm from the lens. Is it possible to capture this image on a screen? Select a correct option from the following: (a) Yes, as the image formed will be real. (b) Yes, as the image formed will be erect. (c) No, as the image formed will be virtual. (d) No, as the image formed will be inverted.

Select the correct option for each of the following questions

Observe the diagram which shows the path of an incident ray through an optical plane LL" of a lens. The focal length of the lens is 20 cm.

7(i)2021

MCQEasy1 mark

If an object is placed at a distance of 30 cm in front of this lens, then: (a) the image will be virtual (b) the image will be diminished and inverted. (c) the image will be diminished. (d) the image will be real and magnified.

7(ii)2021

MCQEasy1 mark

This type of lens can be used: (a) to correct hypermetropia. (b) to correct myopia. (c) to diverge light. (d) in the front door peepholes.

7(iii)2021

MCQEasy1 mark

An object is placed in front of this lens at a distance of 60 cm. Then the image distance from the lens with proper sign convention is: (a) +60 cm (b) +30 cm (c) -30 cm (d) +15 cm

7(iv)2021

MCQEasy1 mark

An object is placed in front of this lens at a distance of 60 cm. Then the magnification of the image is: (a) 0.25 (b) 1.25 (c) -0.5 (d) 1

2(d)

Where should an object be placed in front of a convex lens in order to get :

2(d)(i)2020

Short answerEasy1 mark

an enlarged real image

2(d)(ii)2020

Short answerEasy1 mark

enlarged virtual image ?

6(c)

A lens of focal length 20 cm forms an inverted image at a distance 60 cm from the lens.

6(c)(i)2020

Short answerEasy1 mark

Identify the lens.