Question

A man can see the object placed at 25cm with help of concave lens of focal length 37.5cm.what is distance of image formed from his eye

Answer 1

Given

U = - 25cm

F = - 37.5cm

To find v

By lens formula

1/f=1/v-1/u

1/f+1/u = 1/v

1/-37.5+1/-25 = 1/v

-1/37.5-1/25 =1/v

-1-1.5/37.5 =1/v

-2.5/37.5= 1/v

-37.5/2.5 = v

-15cm =v

Therefore the distance from eye of image formation is -15cm .

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