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(a) Figure shows two isosceles right ang...

(a) Figure shows two isosceles right angled prisms A and B and the light rays incident on the prism A. complete the diagram to show the rays emerging out of the prism B.
(b) State the principle used for completing the ray diagram in part (a) above.

Text Solution

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(a) The completed ray diagram is given below in figure.

(b) The following two principles have been used :
(i) The ray of light falling normally on the glass-air surface or air-glass surface, passes undeviated through it (i.e., if `i=0^(@),r=0^(@)`).
(ii) The ray of light ravelling from glass, when strikes the glass-air surface at an angle of incidence equal to `45^(@)` which is greater than the critical angle (`=42^(@)` for glass-air), sufers total internal reflection.
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