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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 400 and 630 nm.  The minimum thickness of the soap solution is

a)

420 nm

b)

450 nm

c)

630 nm

d)

1260 nm


Question ID - 150030 :-

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 400 and 630 nm.  The minimum thickness of the soap solution is

a)

420 nm

b)

450 nm

c)

630 nm

d)

1260 nm

1 Answer
5876 Votes
3537

Answer Key : (b) -

(b)

Or 

If  then

Therefore, thickness of soap solution is given by

Or  



Next Question :

What is the minimum thickness of a thin film required for constructive interference in the reflected light from it?

Given, the refractive index of the film = 1.5, wavelength of the light incident on the film = 600 nm

a)

100 nm

b)

300nm

c)

50 nm

d)

200 nm


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