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# Class 10 FRANK Solutions Physics Chapter 2.2 - Refraction Through A Lens

Strengthen your Physics preparation with Frank Solutions for ICSE Class 10 Physics Chapter 2.2 Refraction through a Lens. Get clear answers on the differences between a concave lens and a convex lens. Learn to draw a ray diagram, the divergent action of a concave lens and the convergent action of a convex lens. Also, use our expert solutions to understand the focal plane of a lens, the principal axis of a lens, the virtual image and other concepts.

In addition, use TopperLearning’s other ICSE Class 10 Physics online study resources to revise the important topics of refraction through a lens. Watch video lessons and revision notes to get clarity on Physics concepts. For exam preparation, explore our Physics online mock tests and practice question papers.

## Refraction Through A Lens Exercise 101

### Solution 1

A lens may be defined as a transparent refracting medium bounded by two curved surfaces which are generally spherical.

### Solution 2 ### Solution 3 ### Solution 4

Focal length of a lens: Rays of light can pass through the lens in any direction and hence there will be two focal lengths on either side of the lens and they are referred to as the first focal length and the second focal length of a lens:
(i) First focal length: The distance from the optical centre of the lens to its first focal point is called the first focal length (f1) of the lens.
(ii) Second focal length: The distance from the optical centre of the lens to its second focal point is called the second focal length (f2) of the lens.

### Solution 5

Focal length of a plane mirror is infinity.

### Solution 6

The SI unit of focal length is 'metre'.

### Solution 7

Principal axis of a lens is the line joining the centres of curvatures of the two surfaces of the lens.

### Solution 8

Focal plane of a lens: Rays of light can pass through the lens in any direction and hence there will be two focal planes on either side of the lens and they are referred to as the first focal plane and the second focal plane of a lens:
(i) First focal plane: It is the plane passing through the first focal point and normal to the principal axis of the lens.
(ii) Second focal plane: It is the plane passing through the second focal point and normal to the principal axis of the lens.

### Solution 9 ## Refraction Through A Lens Exercise 102

### Solution 10 ### Solution 11

(i) If the medium on both sides of the lens is same, the first and second focal lengths are equal.
(ii) A ray of light passing through the optical centre of the lens passes undeviated.

### Solution 12 ### Solution 13 ### Solution 14 ### Solution 15 ### Solution 16 ### Solution 17 ## Refraction Through A Lens Exercise 103

### Solution 18 ### Solution 19 