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प्रश्न
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
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उत्तर
- When a light beam travels from water to air. There will be an increase in light speed.
- A light beam travels slower through glass than it does through water.
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संबंधित प्रश्न
Select the correct alternative
The speed of light is maximum in
State the speed of light in (a) air, (b) glass.
State whether light slows down or speeds up in the following cases :
Light going from water to air.
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5.
An obliquely incident light ray bends at the surface due to a change in speed when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have a different speed in the other medium?
Higher Order Thinking Skill.
What do you conclude about the speed of light in diamond. if the refractive index of diamond is 2.41?
Light travels ______ kilometers per second in air or vacuum. In theory, nothing can travel faster than light.
Materials that allow light to pass through completely are known as transparent materials.
Define opaque material.
The speed of light decreases in a denser medium, light bends towards the normal.
