The condition when a lens is called an equi-convex or equi-concave:

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When radii of curvature of the two surfaces of the lens equal.

When height of the two lens are equal

When radii of curvature of the two surfaces of the lens are unequal.

None of the above.

answer is A.

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Detailed Solution

Concept- We shall examine the conditions necessary for a lens to be equi-convex or equi-concave in order to address this query. We'll examine equi-convex and equi-concave lenses mathematically and graphically.
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Two curved surfaces, which may be concave or convex, make form a lens. With all of the surfaces being the same kind and having the same focal length, we can create an equi-convex or equi-concave lens. For such lenses, the first and second primary foci will be situated at an equal distance from the optical centre.
Thus, when the radii of curvature of the two lens surfaces are identical, a given lens is either equi-convex or equi-concave.
Therefore, choice A is the right response.
Hence, the correct answer is option 1,

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