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
Text Solution
Verified by ExpertsB
Sun is at infinity i.e. 
so from mirror formula we have 
.
When water is filled in the tank upto a height of 20 cm , the image formed by the mirror will act as virtual object for water surface. Which will form it’s image at 
such that 
i.e. 
= 
.
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