Physics
If the speed of light going from medium 1 to medium 2 increases, then :
- medium 1 is rarer than medium 2
- medium 2 is rarer than medium 1
- both media are denser
- both media are rarer
Refraction Plane Surfaces
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Answer
medium 2 is rarer than medium 1
Reason — The speed of light depends on the optical density of the medium. Light travels faster in a rarer medium and slower in a denser medium. If the speed of light increases when it moves from medium 1 to medium 2, it means that medium 2 allows light to travel faster.
Therefore, medium 2 must be optically rarer than medium 1, while medium 1 is optically denser.
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The incorrect statement among the following is:
- When a ray of light gets refracted from a denser to a rarer medium, the speed of light decreases.
- The frequency of light does not change on refraction.
- The speed of light V in a medium is related to its wavelength λ and frequency f as V = fλ
- The incident ray, the refracted ray and the normal at the point of incidence all lie in one plane.