power of a lens is 2.5D what is it's focal lenght
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Power = 2.5D
We know, P = 1/f
∴ 2.5 = 1/f
⇒ f = 1/2.5
⇒f = 2/5 or 0.4 m
So the focal length is 0.4 m or 2/5 m.
Hope it helps. Thank you. ☺♥
We know, P = 1/f
∴ 2.5 = 1/f
⇒ f = 1/2.5
⇒f = 2/5 or 0.4 m
So the focal length is 0.4 m or 2/5 m.
Hope it helps. Thank you. ☺♥
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