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11 January, 20:44

A concave lens of power - 2D is placed in contact with a convex lens of power + 1.5D what will be the resultant power

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  1. 11 January, 20:56
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    Answer: - 0.5 D

    Explanation:

    The resultant power can be defined as the sum of powers of all the lenses placed in contact together.

    P = P₁ + P₂ + P₃ + ...

    It is given that power of the concave lens is, P₁ = - 2 D

    Power of the convex lens is, P₂ = + 1.5 D

    Thus, the resultant power when these two lenses are placed in contact with each other are: P = P₁ + P₂ = - 2 D + 1.5 D = - 0.5 D.
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