Question

the velocity of light at in air is 3x10 raise to 8 metre persecond ! Calculate
the velocity of light in diamond of refractive index 2.5.
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Answer 1

Refractive index(n)=(speed in air)/(speed in diamond)

2.5=(3*10^8)/x

x=1.2*10^8m/s

If it is wrong let me know