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?

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

Q. A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.

Q. A convex lens forms an image at the distance

40 c m

on other side of the lens when an object which is placed at

40 c m

away from it . The object is then moved

10 c m

towards the lens then, where will be the image shift?

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The correct option is A 0 cm No Shift in image

The correct option is A
0 cm

No Shift in image