A thin film of soap solution lies on the top of a glass plate . When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 420 and 630 . The minimum thickness of the soap solution are |
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a) |
b) |
c) |
d) |
A thin film of soap solution lies on the top of a glass plate . When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 420 and 630 . The minimum thickness of the soap solution are |
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a) |
b) |
c) |
d) |
(b)
For reflection at the air-soap solution interface, the phase difference is
For reflection at the interface of soap solution to glass also there will be a phase difference of
The condition for max. intensity
For
This is the maximum order where they coincide