In Fig. 4.67, a ray of light PQ is incident normally on the face AB of an equilateral glass prism. Complete the ray diagram showing its emergence into air after passing through the prism. Take critical angle for glass = $42^{\circ}$ .

(a) Write the angles of incidence at the faces AB and AC of the prism.

(b) Name the phenomenon which the ray of light suffers at the face AB, AC and BC of the prism.

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Solution

(a) At the face AB, i = $0^{\circ}$ and at the face AC, i = $60^{\circ}$
(b) At the face AB – Refraction
At the face AB – Total internal reflection
At the face BC – Refraction

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Similar questions

In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:

Q. A ray of light is normally incident on one face of an equilateral glass prism. What will be the angle of incidence at the second face of the prism ?

Q. Name the phenomenon which the ray of light suffers at the face

A B, A C

and

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of the prism.

Q. A ray of light is incident on the face AB of a glass prism ABC having the vertex angle A equal to

30^{\circ}

. The face AC is silvered and a ray of light incident on the face AB retraces its path. If the refractive index of the material of prism is

\sqrt{3}

, the angle of incidence on the face AB is :

Q. At what angle, a ray of light should be incident on the first face

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of a regular glass prism

A B C

so that the emergent ray grazes the adjacent face

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?
(Refractive Index of glass

= 1.6

)

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(a) At the face AB, i = 0∘ and at the face AC, i = 60∘ (b) At the face AB – Refraction At the face AB – Total internal reflection At the face BC – Refraction

(a) At the face AB, i = $0^{\circ}$ and at the face AC, i = $60^{\circ}$
(b) At the face AB – Refraction
At the face AB – Total internal reflection
At the face BC – Refraction