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Q.

The eye of a farsighted person has a near point of 90cm. Objects nearer than 90cm cannot be seen clearly. A converging lens is used to correct the vision of a book placed 25cm from the eye. Find the focal length of this lens.

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a

– 34.6cm

b

+ 34.6cm

c

– 40 cm

d

+ 40 cm

answer is D.

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Detailed Solution

1f=1v-1u;u=-25 cm,v=-90 cm

1f=1-90-1-25;f=+34.6 cm

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