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Q.

Is it true that, when a light ray passing from one medium to another, the measure of bending of light is the index of refraction of a substance.

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is true.
The light ray changes its direction or bends at the junction separating the two mediums by the medium's refraction index. The rays tend to bend towards or away from the normal when the light travels from one medium to another with a greater refractive index.
When light enters a material with a greater refractive index, the angle of incidence will be more than the angle of refraction, as the light gets refracted towards the surface's normal. Therefore, the greater the refractive index, the nearer to the normal direction the light will travel.

n_{m} = \frac{speed oflight in air}{speed of light in a medium}

= \frac{c}{v}

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Is it true that, when a light ray passing from one medium to another, the measure of bending of light is the index of refraction of a substance.