Which of the pictures below shows a concave lens?Select one:a. Ab. Bc. Cd. D

(D)
Explanation
A concave lens is thinner in the middle than it is at the edges. This causes parallel rays to diverge
now, in the options we have
A plano concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length,
so, the answer is
(D)
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