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Question

The intensity of a point source of light, S, placed at a distance d in front of a screen A, is I0 at the center of the screen.  Find the light intensity at the center of the screen if a completely reflecting plane mirror M is placed at a distance d behind the source, as shown in figure. 


 


Your Answer
A
27 I09 
Your Answer
B
25 I09
 
Your Answer
C
17 I09 

 
Correct Answer
D
10 I09 

Solution

The correct option is D 10 I09 
E1=I0=Ld2, without mirror


and E2=Ld2+L(3d)2

=Ld2[1+19]=10I09with mirror.

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