Q13 of 26 Page 1

(a) A ray of light is incident normally on the face AB of a right-angled glass prism of refractive index aμg = 1.5. The prism is partly immersed in a liquid of unknown refractive index. Find the value of refractive index of the liquid so that the ray grazes along the face BC after refraction through the prism.

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(b) Trace the path of the rays if it were incident normally on the face AC.


Since, the ray grazes along BC, angle of incidence becomes = 90° and angle of refraction = 60°

Refractive index of prism aμg = 1.5


Refractive index of liquid, aμl = aμg ×


= 1.5 ×


= 1.2975


≈ 1.3


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