Question

The refractive index of denser medium with respect to rarer medium is 5/4,then the refractive index of rarer medium with respect to denser medium will be?

Answer 1

Answer:

since the ray travels from a denser medium(glass) to a rarer medium(air), the ray of light will bend away from the normal, and hence the angle of refraction will be greater than angle of incidence. Hence the refractive index of air with respect to glass will be lesser than 1.

Answer 2

if light travel from denser to rarer medium with n_i > n_r then equation written will give relation of refraction of index of rarer medium to denser medium.

The refractive index of of denser to rarer medium is less than one because when light pass from denser to rarer medium, the light bend away from the normal thus incidence angle is less than refraction angle

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Explanation:

if ray of light is traveled from one medium to other then by snells law we can defined relation between them

$n_i sin(i) = n_r sin(r)$

$\frac{sin(i)}{sin(r)} =\frac{n_r}{n_i}$

where n_i is refractive index of one medium and n_r is referective index of other

and sin i represent incidence angle and sin r represent refraction angle

if light travel from denser to rarer medium with n_i > n_r then equation written will give relation of refraction of index of rarer medium to denser medium.

The refractive index of of denser to rarer medium is less than one because when light pass from denser to rarer medium, the light bend away from the normal thus incidence angle is less than refraction angle

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