जब प्रकाश एक भिन्न माध्यम में प्रवेश करते समय मुड़ता है तो यह …….. कहलाता है। When light deviates, while entering into another medium then it is called

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जब प्रकाश एक भिन्न माध्यम में प्रवेश करते समय मुड़ता है तो यह …….. कहलाता है। When light deviates, while entering into another medium then it is called