science
Grade-7
Easy
Question
The angle between the incident ray and the emergent ray for refraction through multiple mediums is ___ degrees.
Hint:
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°
