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]

16 cm above water level

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9 cm above water level

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24 cm below water level

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9 cm below water level

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Solution

The correct option is B
9 cm above water level

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Similar questions

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]

\frac{4}{3}

60 cm

20 cm

μ = \frac{4}{3}

(μ = 1.33)

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