Exams › SSC CGL (Prelims) › General

When light travels from air to glass, what happens to its speed?

1. Increases
2. Decreases
3. Remains same
4. Becomes zero

Correct answer: Decreases

Solution

When light enters a denser medium like glass from air, its speed decreases because the refractive index of glass is higher. The frequency remains the same, but wavelength changes.

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