The index of refraction of flised quartz is 1.472 for light of wavelength 400 nm and is 1.452 for light of wavelength 760 nm. Find the speeds of light of these wavelengths in fused quartz.

Answer

A, B, D

Explanation

We know that `mu_2/mu_1=v_1/v_2`
so, `1.472/1=(3xx10^8)/`
`rarr v_400=2.04xx10^8m m/sec`
`[:. For air mu=1 and v=3xx10^8m/s]`
Again, `1.452/1=(3xx10^8)/v_760`
`rarr `v_760=2.07xx10^8m/sec`