Question

When two lens of different focal lengths are said to be symmetric?

Answer 1

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ȯ It is symmetric. And it has two focal points, one on this side, so that is one focal point. And then it has another focal point, the exact same distance, on the other side. This lens is symmetric.

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Answer 2

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• Rays of light are brought closer together when they pass through the lens and the distance between the principal focus and the centre of the lens is called the focal length.
• A convex lens consists of two circular arc.
• when the two arcs of a lens have equal radius, it is called a symmetric lens.

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