SaraNextGen Study App [2023-24]
Last Updated On [03-11-2023]

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 :-

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

1 Answer
5876 Votes
3537

Answer Key : (b) -

(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



Next Question :

A person cannot see properly beyond 2 m. Power of the lens is

a)

0.5 D

b)

1.5 D

c)

-2.5 D

d)

-0.5 D


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