Question

Power of a convex lens is 2D. It's focal length Will be:

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Answer 1

Given,

Power of lens = P = −2D. 

As, power is in negative sign (−), it means it is a diverging lens or concave lens.

We know that, 

Power=1focal length (in meters)

Putting the given value in the formula we get-

−2=1f

f=1−2

f=0.5m

f=50cm

Hence, the focal length of the combination will be 50cm.

Explanation:

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