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वायु के सापेक्ष काँच एवं जल के अपवर्तनांक क्रमश: `3/2` एवं `4/3` है। काँच से जल पर आपतित प्रकाश किरण के लिए क्रांतिक कोण का मान ज्ञात कीजिये।

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प्रश्नानुसार `._(a)n_(g)=3/2` तथा `._(a)n_(w)=4/3`
`therefore ._(w)n_(g)=(._(a)n_(g))/(._(a)n_(g))=(3//2)/(4//3)=9/8`
काँच से जल पर आपतित प्रकाश किरण के लिए, यदि क्रांतिक कोण c है, तो
`sin c =1/(._(w)n_(g))=1/(9//8)=8/9` अतः `c=sin^(-1)(8/9)`

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