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Question

An optical device is constructed by fixing three identical convex lenses of focal lengths 10 cm each inside a hollow tube at equal spacing of 30 cm each. One end of the device is placed 10 cm away from a point source. How much does the image shift when the device is moved away from the source by another 10 cm?


A

0 cm

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B

5 cm

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C

15 cm

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D

45 cm

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Solution

The correct option is A

0 cm


No Shift in image


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