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Parallel rays of light from Sun falls on...

Parallel rays of light from Sun falls on a biconvex lens of focal length f and the circular image of radius r is formed on the focal plane of the lens. Then which of the following statement is correct?

A

Area of image `pir_(2)` directly proportional to f

B

Area of image `pi r_(2)` directly proportional to `f^(2)`

C

Intensity of image increases if f is increased.

D

If lower half of the lens is covered with black paper area of image will become half.

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The correct Answer is:
B
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MOTION-GEOMETRICAL OPTICS-Exercise - 4 | Level-II
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  2. Graph of position of image vs position of point object from a convex l...

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  3. Parallel rays of light from Sun falls on a biconvex lens of focal leng...

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  4. A simple telescope used to view distant objects has eyepiece and objec...

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  5. A ray of light travelling in water is incident on its surface open to ...

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  6. Statement-1 The formula connecting u,v and f for a spherical mirror is...

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  7. In an experiment to determine the focal length (f) of a concave mirror...

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  8. Two beam of red and violet colors are made to pass separately through ...

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  9. A light beam is traveling from Region I to region IV (refer figure). T...

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  10. An optical component and an object S placed along its optic axis are g...

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  11. A ball is dropped from a height of 20 m above the surface of water in ...

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  12. A student performed the experiment of determination of focal length of...

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  13. A ray OP of monochromatic light is incident on the face AB of prism AB...

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  14. The focal length of a thin biconvex lens is 20 cm. When an object is m...

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  15. A biconvex lens of focal length 15 cm is in front of a plane mirror. T...

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  16. A large glass slabe (mu=5//3) of thickness 8cm is placed over a point ...

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  17. Image of an object approaching a convex mirror of radius of curvature ...

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  18. Two transparent media of refractive indices mu(1) and mu(3) have a sol...

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  19. An initially parallel cylindrical beam travels in a medium of refracti...

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