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in Physics by (25.3k points)
निर्वात् में प्रकाश की तरंगदैर्घ्य `6400Å` है । जल का अपवर्तनांक `4//3` है जल में इस प्रकाश की तरंगदैर्घ्य होगी :
A. `1600Å`
B. `4800Å`
C. `6400Å`
D. `8332Å`

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