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Question

If object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm. find out the image distance formed by lens II from O?


A

180 cm

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B

120 cm

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C

60 cm

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D

90 cm

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Solution

The correct option is A

180 cm


For lens I, since object is at 2f (i.e. 60 cm) image of lens I is formed at 60 cm from a between lens I & II.

1v - 1u = 1f

1(v) + 160 = 145

v = 180 cm


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