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A small bulb is placed at the bottom of ...

A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

A

`(d)/(D)h`

B

`[(d)/(D)-1]`

C

`h`

D

zero

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The correct Answer is:
B
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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 2 (One or more than one correct answer)
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  11. A U-tube of base length l filled with the same volume of two liquids o...

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  12. A U-tube of base length l filled with the same volume of two liquids o...

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  14. A square box of water has a small hole located the bottom corners. Whe...

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  15. Water filled in an empty tank of area 10 A through a tap of cross sect...

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  19. The U-tube shown has uniform cross-section A liquid is filled in the t...

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