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Q.

A point object O is placed on the principal axis of a convex lens of focal length 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. if the eye is placed 60cm to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be

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a

0

b

5cm

c

2.5cm

d

10cm

answer is C.

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Detailed Solution

  1f=1v-1u 120=1v-1-40 v=40cm                   

h20=540=18

Or h=208cm=52cm=2.5cm


 

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