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In the figure shown, O is a point source...

In the figure shown, O is a point source of light and S is a screen placed at a distance L from the source. Intensity of light at point A on the screen due to the source is 81 I where I is some unit. Now a large mirror (M) is placed behind the source at a distance L from it. The mirror reflects 100% of the light energy incident on it. Calculate the inten- sity at point A. ,brgt

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