Multiple choice

What is the term used to mention the measure of how greatly a substance slows the velocity of light?

  1. Focal point

  2. Focal length

  3. Resolution

  4. Refractive index
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 When a ray of light passes from one medium to another refraction occurs, that is, the ray is bent at the interface. The direction and magnitude of bending is determined by the refractive indexes of the two media forming the interface.

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