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प्रश्न
State the speed of light in (a) air, (b) glass.
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उत्तर
(a) Air — 3 × 108
(b) Glass — 2 × 108
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संबंधित प्रश्न
Write true or false of the following statement.
The speed of light in vacuum is 3 × 108 ms-1.
Select the correct alternative
The speed of light is maximum in
State whether light slows down or speeds up in the following cases :
Light going from air to glass.
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
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 Skills.
Light ray emerges from water into air. Draw a ray diagram indicating the change in its path in water.
Materials that allow light to pass through completely are known as ______ material.
The speed of light decreases in a denser medium, light bends towards the normal.
Light is one of the slowest traveling energy with a speed of 3 × 10-8ms-1
Light travels a distance of '10x' units in time 't1' in vacuum and it travels a distance of 'x' units in time 't2' in a denser medium. Using this information answer the question that follows:
'Light covers a distance of '20x' units in time 't1' in diamond'. State true or false.
