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
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
a)
b)
c)
d)
Question ID - 150103 | SaraNextGen Top Answer
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
a)
b)
c)
d)
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A thin film of soap solution |
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a) |
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b) |
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c) |
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d) |
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(b)
For reflection at the air-soap solution interface, the phase difference is 
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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
