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A converging lens is used to form an ima...

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

A

half the image will disappear

B

complete image will disappear

C

intensity of image will increase

D

intensity of image will decrease

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The correct Answer is:
D
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DC PANDEY ENGLISH-RAY OPTICS-Checkpoint 9.4
  1. An air bubble contained inside water. It behaves as

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  2. A convex lens has a focal length of 20 cm. It is used to form an image...

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  3. In figure, an air lens of radius of curvature of each surface equal to...

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  4. A plano convex lens is made of glass of refractive index 1.5. The radi...

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  5. At what distance from a convex lens of focal length 30cm an object sh...

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  6. A plano-convex lens is made of flint glass, its focal length is

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  7. Distance of an object from a concave lens of focal length 20 cm is 40 ...

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  8. Where should an object be placed from a converging lens of focal lengt...

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  9. An object is placed at 10 cm from a lens and real image is formed with...

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  10. The real image which is exactly equal to the size of an object is to b...

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  11. A plano-convex lens of curvature of 30 cm and refractive index 1.5 pro...

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  12. The minimum distance between an object and its real image formed by a ...

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  13. A convex lens of refractive index 3/2 has a power of 2.5^(@). If it is...

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  14. Two thin lenses of focal length f(1) and f(2) are in contact and coaxi...

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  15. Two thin lenses, one of focal length + 60 cm and the other of focal le...

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  16. A convex lens of focal length 40 cm is in contact with a concave lens ...

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  17. Two similar planoconvex lenses are combined together in three differen...

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  18. A convex lens of focal length f cut into parts first horizontally and ...

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  19. A converging lens is used to form an image on a screen. When the upper...

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  20. If in a plano-convex lens, the radius of curvature of the convex surfa...

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