Question

A doctor has prescribed a corrective lens of power 1.5D. The focal length of the lens is

a 0.5 meter
b 0.6metre
c 0.7centimetre
d 0.6centimetre​

Answer 1

Given

P = +1.5 D

Find out

We need to find out the focal length of the given lens

Solution

We know that

f = 1/P

Where,

f is the focal length

P is power

f = 1/P

= 1/+1.5 = 0.67 m.

As the power of the lens is (+ve), the lens is converging.

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