1.

A lens has a power of + 4.0 D. It is :(a) A convex lens of focal length 4 m(b) A concave lens of focal length 4 m(c) A convex lens of focal length 0.25 m(d) A concave lens of focal length 0.25 m

Answer»

Correct answer is (c) A convex lens of focal length 0.25 m

As P is '+ve', lens is convex.

f(in meters) = 1/D = 1/4 = 0.25 m.



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