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10-04-2024
Physics

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If the critical angle for total internal reflection from a medium to vacuum is 30°. Then velocity of light in the medium is:
a. 3 x 10⁸ m/s
b. 2.5 x 10⁸ m/s
c. 4.5 x 10⁸ m/s
d. 1.5 x 10⁸ m/s

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