Question

In the given diagram a beam consisting of red, blue and yellow colours is incident normally on the face AB of an isosceles right angled prism. Given that the critical angle of glass –air interface for yellow colour is 450.

Answer 1

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Answer 2

The ray diagram is attached below:

• The critical angles for beams of different wavelengths are different.
• The Refractive Index is inversely proportional to the wavelength of the light. ∴μ blue  > μ green > μ yellow > μ red.

• Since RI is inversely proportional to the critical angle ⇒ ∅ red > ∅ yellow >  ∅ green > ∅ blue
• Given that ∅ yellow = 45° so ∅ red > 45°.
• Also ∅ green and blue < 45°

(The complete question is: In the given diagram a beam consisting of red, blue, and yellow colors is incident normally on the face AB of an isosceles right-angled prism. Draw the ray diagram to show the refracted and emergent rays. Given that the critical angle of the glass-air interface for yellow color is 45°)