Refraction is the change in direction of light when it passes from one medium to another. The working of a lens is based on the refraction of light when they pass through it. Lens is a transparent glass which is bounded by two spherical surfaces. The light rays are refracted after passing through the lens. It is of two types, convex lens and concave lens.

Convex lens: This lens bulges out at the centre and is thinner at the edges, i.e. the two sides.
Concave lens: This lens is thinner at the centre and thick at the two sides.

This video will give you complete clarity about the behaviour and use of concave and convex lenses when a ray of light passes through them-in practical day to day life - simple yet very powerful explanation by Imran Sir

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