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 
from the mirror. If the tank filled with water 
upto a height of 
, then the sunlight will now get focussed at
a)
16 
above water level
b)
above water level
c)
below water level
d)
9 
below water level
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 from the mirror. If the tank filled with water upto a height of , then the sunlight will now get focussed at
a)
16 above water level
b)
above water level
c)
below water level
d)
9 below water level
Question ID - 152774 | SaraNextGen Top Answer
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 from the mirror. If the tank filled with water upto a height of , then the sunlight will now get focussed at
a)
16 above water level
b)
above water level
c)
below water level
d)
9 below water level
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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 |
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a) |
16 |
b) |
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c) |
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d) |
9 |
(b)
Sun is at infinity, 
so from mirror formula we have 
When water is filled in the tank upto a height of 
, the image formed by the mirror will act as virtual object for water surface. Which will form it’s image at 
such that 
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