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When a ray of light passes through a thin walled hollow glass prism of thickness \mathrm{t} and refractive index 1.5. which one is wrong?

Option: 1

 the angular deviation is equal to zero


Option: 2

maximum deviation takes places


Option: 3

no dispersion takes place


Option: 4

Lateral shift is equal to \mathrm{2t/3}


Answers (1)

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When a ray of light passes through a glass slab of uniform thickness the incident ray is parallel to the imergent ray. Therefore no angular deviation takes place. We know that the ray of light when passing through a thin walled glass suffers a lateral shift \mathrm{x=t\left(1-\frac{1}{\mu}\right)=t\left(1-\frac{1}{1.5}\right)=\frac{t}{3}} in first wall 1 . Similarly in second wall 2 it suffers a lateral shift of equal magnitude. Therefore the total lateral shift is equal to \frac{2 t}{3}.  In each case there will be no angular deviation. Therefore no dispersion takes place.

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seema garhwal

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