Question

A lens is bounded by two spherical surfaces curved inward is called *

Answer 1

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A lens bound by two spherical surfaces curved inwards is called a bi-concave lens or simply a concave lens. It is thinner in the middle than the edges. The central point of a lens is called its optical center.

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Answer 2

A lens having two spherical surfaces both curved inside is called a concave lens.

• Because it is shaped round inwards at the center and bulges outwards through the edges, causing the light to diverge, a concave lens is also known as a diverging lens.

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