Question

A beam of plane polarised light of wavelength 560 nm falls on a crystal of iceland spar at right angles to its optical axis. The wavelengths of ordinary and extraordinary rays in the crystal if refractive indices of the rays respectively are 1.6 and 1.4​

Answer 1

Answer:

Wavelength of ordinary ray is 350 nm and wavelength of extraordinary ray is 400 nm

Explanation:

As we know that wavelength of light changes with the medium in which it travels

so here we know that

$\lambda_m = \frac{\lambda_{air}}{\mu}$

now we know for ordinary ray the refractive index of the medium is given as

$\mu = 1.6$

so we have

$\lambda_1 = \frac{560nm}{1.6}$

$\lambda_1 = 350 nm$

Similarly for extraordinary ray the refractive index of the medium is given as

$\mu = 1.4$

$\lambda_2 = \frac{560 nm}{1.4}$

$\lambda_2 = 400nm$

#Learn

Topic : Wavelength in medium

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