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What happens to the speed of light as it passes from air into a denser medium li

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Question: What happens to the speed of light as it passes from air into a denser medium like glass?

Options:

  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Correct Answer: It decreases

Solution: 

The speed of light decreases when it passes from a less dense medium (air) to a denser medium (glass) due to the change in refractive index.

What happens to the speed of light as it passes from air into a denser medium li

Practice Questions

Q1
What happens to the speed of light as it passes from air into a denser medium like glass?
  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Questions & Step-by-Step Solutions

What happens to the speed of light as it passes from air into a denser medium like glass?
Correct Answer: The speed of light decreases.
  • Step 1: Understand that light travels at a certain speed in air, which is faster than in other materials.
  • Step 2: Recognize that air is less dense than glass.
  • Step 3: When light moves from air (less dense) into glass (denser), it encounters more particles.
  • Step 4: These particles in glass slow down the light as it passes through.
  • Step 5: This slowing down of light results in a decrease in its speed.
  • Refraction of Light – The phenomenon where light changes speed and direction when passing from one medium to another, influenced by the refractive index.
  • Refractive Index – A measure of how much the speed of light is reduced in a medium compared to its speed in a vacuum.
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