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Standard XII
Physics
Cutting of Thin Lenses
Question

A convex lens form a real image of a point object placed on its principal axis. if the upper half of the lens is painted black,
  1. the image will be shifted downward
  2. the image will be shifted upward
  3. the image will not be shifted
  4. the intensity of the image will decrease

A
the image will be shifted upward
B
the intensity of the image will decrease
C
the image will not be shifted
D
the image will be shifted downward
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Solution
Verified by Toppr

By painting upper half of lens, the focal length of the lens will not change,hence the image will form on the same position. But, now the amount of light forming image (light refracted through lens) will be less since half of the lens is painted, thus, the image will be of low intensity.

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