Question

FIND THE FOCAL LENGTH OF THE LENS OF POWER -2 D? WHAT TYPE OF LENS IS THIS? *

2 points

POWER = 5 m , CONVEX LENS

B) POWER = -5 m , CONVEX LENS

C) POWER = 5 m , CONCAVE LENS

D) POWER = -5 m , CONCAVE LENS

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Answer 1

For knowing the answer you must learn the formula 1/f = power and if the power comes out to be in a minus sign then it is a concave lens....

Explanation:

so -2=1/f

-2f = 1

f= -0.5

and it is a concave lens

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