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क्रांतिक कोण को परिभाषित करें तथा इसकी शर्तों को लिखें?

‌‌क्रांतिक कोण को परिभाषित करें तथा इसकी शर्तों को लिखें?
वह आपतन कोण  जिसका तदनुरूपी अपवर्तन कोण 90 डिग्री होता है दिए हुए माध्यमों के युगल क्रांतिक कोण कहलाता है।

क्रांतिक कोण के लिए शर्तें-
1). किरण सघन माध्यम से विरल माध्यम में प्रवेश कर रहा हो।
2). पूर्ण आंतरिक परावर्तन के लिए आपतन कोण क्रांतिक कोण से अधिक होना चाहिए।

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