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  4. If A is the angle of prism, r angle of refraction, then the condition for minimum deviation is

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Q. If $A$ is the angle of prism, $r$ angle of refraction, then the condition for minimum deviation is

COMEDKCOMEDK 2014Ray Optics and Optical Instruments

Solution:

As $r_1 + r_2=A$
At minimum deviation, $r_1 = r_2 = r$
$\therefore \, 2r = A$

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