1.

If the power of a lens is - 4.0 D, then it means that the lens is a A. concave lens of focal length -50 m B. convex lens of focal length +50 cm C. concave lens of focal length -25 cm D. convex lens of focal length -25 m

Answer»

Correct option is C. concave lens of focal length -25 cm

P = -4 D

P = 100/f(cm 

f(cm) = 100/p

100/−4 = -25 cm.

Negative focal length means concave lens. Concave lens of focal length -25 cm.



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