Explain why it is E 7. The tab le lists the index of refraction for various subs

Question

Explain why it is E 7. The tab le lists the index of refraction for various substances at 20 °C for light with a wavelength of 589 nm in a vacuum. Through which substance will light with a vacuum wavelength of 589 nm travel with the slowest speed? sed quartz Ethyl alcohol (c) Erown glass fused quartz ethyl alcohol crown glass carbon tetrachloride crystalline quartz 1.458 1.362 1.520 1.461 1.544 (d) Carbon tetrachloride Crystalline quartz (f) None of the above answers are correct as there is not enough information given.

Explanation / Answer

we know spped of light in material,

v = c/n

here c--> speed of light in vaccume

n ---> refrractive index of material.

so, v is inversly proportional n.

in the given materials crystalline quartz has highest refractive index(1.544).

so, light speed is lowest in the crystalline quartz.

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