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An optical device is constructed by fixi...

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

B

5 cm

C

15 cm

D

45 cm

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The correct Answer is:
A
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