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?

0 cm

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5 cm

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15 cm

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45 cm

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Solution

The correct option is A
0 cm

No Shift in image

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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?

Q. A point source of light is moving at a rate of

2

c m - s^{- 1}

towards a thin convex lens of focal length

10 c m

along its optical axis. When the source is

15 c m

away from the lens the image is moving at

A point source of light is moving at a rate of 2 cm-s $^{- 1}$ towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at

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