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| Numerical - 19 |
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| 19. In Young's double slit experiment what is the intensity at a point on screen where the two waves arrive at a phase difference of (i) 600 (ii) 900 and (iii) 1200? |
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| Suggested solution: |
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Let I0 be the intensity of either of the interfering sources, the intensity
I at a point P is  where d
is the phase difference at p between the two disturbances. |
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| (i) d = 600 ; I = Io cos2 (300) |
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| (ii) d = 900 ; I = 4Io cos2(450) |
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| (iii) d = 1200; I = 4 Io cos2(600) |
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