science
Grade-7
Easy

Question

The angle between the incident ray and the emergent ray for refraction through multiple mediums is ___ degrees.

hintHint:

Parallel to each other

The correct answer is: 0


    • When a ray of light is incident on the surface of different medium, it undergoes refraction.
    • As the medium is denser and has a higher refractive index than air, the ray of light bends towards the normal.
    • The same ray of light which is refracted acts as the incident ray on the inner surface of the medium.
    • It undergoes refraction again and comes out of the medium as an emergent ray. This time the ray bends away from the normal.
    • As the ratio of refractive indices of air and the mediums remains the same in both cases (though their value gets inverted), the emergent ray is parallel to the incident ray.
    • Angle will be 0°

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