For the given incident ray as shown in figure , the condition of total internal reflection of ......

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Q.17 ..--- For the given incident ray as shown in figure , the condition of total internal reflection of this ray the required refractive index of prism will be .
(a) root 3 + 1 / 2
(b) root 2 + 1 / 2
(c) root of 3/2
(d) root of 7/6

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grazing emergence ki condition kyu laga na h sir?? TIR m it's totally reflected back na??

akanksha_