JEE Main & Advanced
Physics
Ray Optics
Question Bank
Topic Test - Reflection of Light
question_answer
A man is sitting in a room at 2 m from a wall \[{{W}_{1}}\] wants to see the full height of the wall \[{{W}_{2}}\] behind him 4 m high and 6 m away from the facing wall \[{{W}_{1}}\]. What is the minimum vertical length of mirror on the facing wall required for the purpose?
A)4 m
B)2 m
C)3 m
D)1 m
Correct Answer:
D
Solution :
[d] Let the min. length of mirror be L \[\frac{L}{4}=\frac{2}{8}\Rightarrow L=1m\]