Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Two equilateral-triangular prisms 
and 
are kept with their sides parallel to each other, in vacuum, as shown in the figure. A light ray enters prism 
at an angle of incidence 
such that the outgoing ray undergoes minimum deviation in prism 
. If the respective refractive indices of 
and 
are and
, where the value of 
is .
Text Solution
Verified by ExpertsThe correct answer is:
12
(12)
By using optical reversibility principle
For prism
Minimum deviation
For prism 
Incident angle will be 
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