Question

Find the focal length of a lens of power - 2.0 D. What type of lens is this?
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Answer 1

Answer:

concave lens as the power is negative.

the focal length of a lens is 0.5 m

power = 1/ focal length

Answer 2

Answer:

P = -2D

P = 1/f

-2= 1/f

f = -1/2m

f = -50cm

This is concave lens as it has negative Focal length.

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