Study the diagram below. Complete the diagram to form the image of the object AB.

A diverging lens is a concave lens. The refraction of light rays as they pass through the lens determines how well the lens works. When light rays enter a concave lens, they diverge, causing the lens to behave like a diverging lens. Concave lenses create only virtual images.

Study the diagram given below. State the three characteristics of the image.

The convex lens is comparably thick in the middle and narrow at the bottom and upper borders, and converges light rays that move parallel to its principal axis (i.e. converges incident rays towards the principal axis). The edges curve outward instead of bending within. The image is always virtual. The image is always erect. The image is always diminished in size.

Study the diagram given below. Name a device in which this action of lens is used.

This action of lens is used in a magnifying glass. Convex lenses converge parallel rays going in and, convex lenses diverge rays. A convex lens is useful as a magnifying glass as it will produce a virtual enlarged image if the object is brought within the focal length.

Study the diagram below. Name the lens LL’

LL' is concave lens. Concave lenses always form virtual images, so magnification produced by a concave lens is always positive. A concave lens always forms the image smaller than the object.

E M B I B E

Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 1

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What are the three principal rays that are drawn to construct the ray diagram for the image formed by a lens? Draw diagrams to support your answer.

Important Questions on Refraction Through a Lens

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10th ICSE

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Selina Icse Concise Physics For Class 10>Chapter 5 - Refraction Through a Lens>EXERCISE-5(B)>Q 2

In the diagrams below, $X X^{'}$ represents the principal axis, $O$ the optical centre and $F$ the focus of the lens. Complete the path of the rays $A$ and $B$ as they emerge out of the lens.

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