Question

doctor advised to use 5D lens then its focal length is​

Answer 1

Answer:

p=100/fcm

50=100/f cm

f=20

Answer 2

RELATION OF FOCAL LENGTH AND POWER:

The power of a lens is defined as the reciprocal of its focal length

D = 1/f

where D is the power in diopters

and f (focal length) in meters.

Power of a Lens - The power of a lens is its ability to bend light. Greater the power, greater the refraction of light.

Explanation:

Here Power (P)= 5d

P= 1/f

5=1/f

f= 1/5m

f= 1*100/5

= 20cm

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