In a Young's double-slit experiment, the ratio of the slit's width is 4 : 1 . The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be

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I n t e n s i t y ∝ w i d t h o f s l i t I 1 I 2 = 4 1 . I m a x I m i n = I 1 + I 2 I 1 - I 2 2 = I 1 I 2 + 1 I 1 I 2 - 1 2 = 4 + 1 4 - 1 2 = 3 1 2 = 9 1 I m a x : I m i n = 9 : 1

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