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A pile 4 m high stands in the lake,such ...

A pile 4 m high stands in the lake,such that it protrudes y 1m above the surface of water.Determine th elength of the shadow of the pile on the botton of lake,when the sunrays make an angle of `45^@` with the water surface.Tke refractive index of water,`mu=4//3`.
.

A

6 cm above the surface o water.

B

6 cm below the surface of water

C

18 cm above the wurface of waer

D

32 cm above the surface of water.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. The value of the critial angle is least for which of the following col...

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  2. Answer the following questions: A diver under water, looks obliquely ...

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  3. A pile 4 m high stands in the lake,such that it protrudes y 1m above t...

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  4. A transparent cube of side 210 mm contains a small air bubble. Its app...

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  5. If the critical angle for total internl reflection from a medium to v...

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  6. Light enters at an angle of incidence in a transparent rod of material...

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  7. Explain the formation of mirage.

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  8. Twinkling of stars is due to atmospheric:

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  9. Twinkling of stars is due to atmospheric:

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  10. A plano-convex lens is made of refractive index 1.6.If the radius of c...

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  11. A convex lens becomes less converging when placed in

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  12. An air bubble inside the water behaves as:

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  13. A lens behaves as a converging lens in air and diverging lens in wate...

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  14. A point source of light B,placed in front of the centre of a mirror of...

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  15. Two lenses have powers + 1 D and - 2 D respectively ,The power of comb...

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  16. Two lenses having powers + 6 D and - 4D are placed in contact.The powe...

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  17. An optical (eye specialist)prescibes spetacles is a pateint with a com...

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  18. The focal length of a convex lens is 30 cm and the size of image is qu...

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  19. A screen is placed 80 cm from an object. The image of the object on th...

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  20. Which of the following pairs can produce erect,diminshed and virutual ...

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