Question

state the codition when a lens is called equicovex or equi concave..?
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Answer 1

Answer:

When radius of curvature of two surfaces are

of lens are equal...

Explanation:

ANSWER

A lens is made up of two curved surfaces which can be concave or convex surfaces. When both the surfaces are of the same kind and have the same focal length, they form an equi-convex or equi-concave lens. For such lenses, the first and second principal focus will be at the same distance from the optical centre.

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