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पारदर्शी माध्यमों A तथा B में, जो एक समतल परिसीमा से पृथक्कृत है, प्रकाश के वेग क्रमश: `2.0 xx10^(8)` तथा `2.0 xx 10^(8)` मीटर/सेकंड हैं। माध्यम A से B में जाने वाली प्रकाश-किरण के लिए परिसीमा पर क्रांतिक कोण हैं:
A. `sin^(-1)(1/2)`
B. `sin^(-1)(2/5)`
C. `sin^(-1)(4/7)`
D. `sin^(-1)(4/5)`

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Correct Answer - d
`._(B)n_(a) = v_(B)/v_(a)= (2.5 xx 10^(8)मीटर/सेकंड)/(2.0 xx 10^(8)मीटर/सेकंड) = 1.25`
अब `sin c=1/(._(B)n_(A))`

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