Question

find the focal length of a lens of power -2.0 D. what type of lens is this?​

Answer 1

Answer:

power = 1/focal length

-2.0 = 1/F.L.

focal length = -2 metre or -200 cm

hence this lens is concave lens as focal length is negative

Explanation:

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Answer 2

Answer:

f = 1/P

= 1/-2

= -0.5 m

the focal length is negative so it will be concave lens