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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

`2.8 m^@`

B

`2.7 m^@`

C

`2.6 m^@`

D

`2.5 m^@`

Text Solution

Verified by Experts

The correct Answer is:
C
`2.6 m^@`
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-D (MULTIPLE CHOICE QUESTIONS (MCQs))(MCQs FROM .DARPAN. BASED ON TEXTBOOK)(MCQs BASED ON TEXTUAL ILLUSTRATION AND EXERCISE)
  1. (i) If f = 0.5 m for a glass lens, what is the power of the lens? (ii)...

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  2. A convex lens has 20 cm focal length in air. What is focal length in w...

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  3. A small candle, 2.5 cm in size is placed at 27 cm in front of a concav...

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  4. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal len...

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  5. A tank is filled with water to a height of 12.5 cm. The apparent depth...

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  6. A small bulb is placed at the bottom of a tank containing water to a d...

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  7. Double-convex lenses are to be manufactured from a glass of refractive...

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  8. What is the focal length of a convex lens of focal length 30cm in cont...

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  9. A small telescope has an objective lens of focal length 144cm and an e...

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  10. (a) A giant refracting telescope at an observatory has an objective le...

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  11. (a) A giant refracting telescope at an observatory has an objective le...

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  12. A small pin fixed on a table top is viewed from above from a distance ...

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  13. The image of a small electric bulb fixed on the wall of a room is to b...

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  14. A screen is placed 90cm from an object. The image of the object on the...

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  15. At what angle should a ray of light be incident on the face of a prism...

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  16. A small telescope has an objective lens of focal length 140cm and an e...

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  17. A small telescope has an objective lens of focal length 140cm and an e...

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  18. For the telescope described in Exercise 9.3 (a), what is the separatio...

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  19. If this telescope is used to view a 100 m tall tower 3 km away, what i...

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  20. (a) For the telescope described in Exercise 9.28 (a), what is the sepa...

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