The given figures show the path of light through lenses of two different types, represented by rectangular boxes A and B. What is the nature of lenses A and B? [3 marks]

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Solution

There are two types of lenes i.e. concave lens and convex lens. A convex lens is converging in nature as it converges all light rays at a point. On the other hand, a concave lens is diverging in nature as it diverges all the light rays. [1 mark]

In the first case (figure A), light rays are converging towards a point, so the lens A will be a convex lens. [1 mark]

In the second case (figure B), light rays diverge or spread out. So, the lens B will be a concave lens. [1 mark]

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