SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

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 :-

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)

1 Answer
5876 Votes
3537

Answer Key : (b) -

(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



Next Question :

The electromagnetic theory of light failed to explain

a)

Photoelectric effect

b)

Polarization

c)

Diffraction

d)

Interference


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