JEE Main & Advanced
Physics
Ray Optics
Question Bank
Self Evaluation Test - Ray Optics and Optical Instruments
question_answer
A point source has been placed as shown in the figure. What is the length on the screen that will receive reflected light from the mirror?
A)2H
B)3H
C)H
D)None of these
Correct Answer:
A
Solution :
[a] In \[\Delta \,ABD,\frac{3D}{3H}=\tan 45{}^\circ \text{ or }BD=3H\] And in \[\Delta A'BC,\frac{BC}{2H}=\tan \theta =\frac{1}{2}\text{ or }BC=H\] \[\text{Now, }y=BD-BC=3H-H=2H.\]