Question

power of a lens is - 5d what is focal length and nature of lens?​

Answer 1

Answer:

We’ve been given that the power of a lens is -5 dioptres or -5D. The focal length of any lens is the inverse of the power of the lens. So, we can find the focal length of the lens usually represented by the variable f as

f=1/D

⇒f=1/−5

Multiplying the numerator and the denominator with 2 on the right side of the above equation, we get

f=2/−10

∴f=−0.2m.

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