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Q. A thin film of soap solution (n = 1.4) lies on the top of a glass plate (n = 1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelength 400 and 630 nm. The minimum thickness of the soap solution is?
For reflection at the air-soap solution interface, the phase difference is π
For reflection at the interface of soap solution to glass also, there will be a phase difference of π.
∴ The condition for the maximum intensity
=2μt=nλ
For n, nλ1=(n−1)λ2
n×420=(n−1)630
∴n(630−420)=630
⇒n(210)=630
⇒n=210630
⇒n=3
This is the maximum order, where they coincide
2×1.4×t=3×420
⇒t=2×1.403×420=450n
Q. Maximum diffraction takes place in a given alit for?
Greater is the wavelength of wave higher will be its degree of diffraction.
Radio waves have maximum wavelength.
Q. Gamma is also an electromagnetic wave like light than why not gamma generates a plane wavefront??
When the point source or linear source of light is at very large distance, a small portion of spherical or cylindrical wavefront appears to be plane, such a wavefront is called a plane wavefront.
In the given options none of sources generates plane wavefront, it can be artificially produced by reflection from a mirror or by refraction through a lens.