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Byju's Answer
Standard XII
Physics
Image Formation in Concave Mirror
A concave mir...
Question

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 32 cm from the mirror. If the tank filled with water

upto a height of 20 cm, then the sunlight will now get focussed at

[UPSEAT 2002]


A

16 cm above water level

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B

9 cm above water level

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C

24 cm below water level

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D

9 cm below water level

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Solution

The correct option is B

9 cm above water level



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Q.

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 32 cm from the mirror. If the tank filled with water

upto a height of 20 cm, then the sunlight will now get focussed at

[UPSEAT 2002]


Q. A concave mirror of radius of curvature 60cm is placed at the bottom of a tank containing water up to a height of 20cm. The mirror faces upwards with its axis vertical. Sunlight falls normally on the surface of the water and the image of the sun is formed. If refractive index of water is 43 then with the observer in air, the distance of the image from the surface of water is
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