A point source of light S at a distance $d$ from the screen A produces light intensity $I_{0}$ at the centre of the screen. If a completely reflecting mirror M is placed at a distance $d$ behind the source as shown in the figure, find the intensity at the centre of the screen

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I 1 ​ = I 0 ​ = 4 π d 2 P ​ The image S 2 ​ of the source is at distance d behind the mirror, so 3 d from the screen. I 2 ​ = 4 π ( 3 d ) 2 P ​ I = I 1 ​ + I 2 ​ = 4 π d 2 P ​ [ 1 + 9 1 ​ ] = 9 10 ​ I 0 ​

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