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A concave mirror is placed at the bottom...

A concave mirror is placed at the bottom of an empty tank with face upwards and axis vertical. When sunlight falls normally on the mirror, it is focussed at distance of `32cm` from the mirror. If the tank filled with water `(mu=4//3)` up to a height of `20cm`, then the sunlight will now get focussed at

A

`16cm` above water level

B

`9cm` above water level

C

`24cm` below water level

D

`9cm` below water level

Text Solution

Verified by Experts

The correct Answer is:
B

`AI=12cm`, `mu=4//3`
`AI=mu(AO)`
`12=4/3(AO)impliesAO=9cm`
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CP SINGH-REFRACTION OF LIGHT BY PLANE SURFACES-Exercises
  1. A container is filled with water (mu=1.33) upto a height of 33.25 cm. ...

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  2. A diverging beam of light from a point source S having devergence angl...

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  3. A concave mirror is placed at the bottom of an empty tank with face up...

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  4. A pile driven into the bottom of a lake extends 3m above the bottom of...

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  5. A concave mirror with its optic axis vertical and mirror facinig upwar...

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  6. The mean distance of sun from the earth is 1.5xx10^8km. The time taken...

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  7. A ray of light composed of blue and red light is incident on a paralle...

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  8. When a ray of light enters a water filled glass tank from a glass face...

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  9. Light passes through a glass slab with parallel sides and thickness t....

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  10. A ray of light is incident on a surface of glass slab at an angle 45^@...

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  11. Two transparent slabs have the same thickness as shown in figure. One ...

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  12. A ray of light is incident on the surface of a glass plate of thicknes...

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  13. Maximum lateral displacement of ray light incident on a slab of thickn...

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  14. Two optical media of refractive indices n1 and n2 contain x and y wave...

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  15. Refractive index of air is 1.0003. The correct thickness of air column...

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  16. If hat(i) denotes a unit vector along incident light ray, hat (r)a uni...

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  17. The apparent depth of water in cylindrical water tank of diameter 2R c...

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  18. Let the x-z plane be the boundary between two transparent media. Media...

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  19. An observer can see through a pin-hole the top end of a thin rod of he...

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  20. The speed of light in medium A is 2.0xx10^8m//sec and that in medium B...

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