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प्रश्न
Write true or false of the following statement.
The speed of light in vacuum is 3 × 108 ms-1.
विकल्प
True
False
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उत्तर
True.
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संबंधित प्रश्न
State whether light slows down or speeds up in the following cases :
Light going from air to glass.
When light travels from a denser to a rarer medium, its speed ______.
A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.
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?
Compare the speeds of light of wavelength 4000 Å (i.e. violet light) and 8000 Å (i.e. red light) in vacuum.
What is the speed of light in vacuum?
Objects that allow light to pass through partially are called ______ material.
Materials that are not able to allow light to pass through, are called ______ material.
Higher-Order Thinking Skills:
M = 2.42 for diamond. What is the meaning of this statement in relation to the speed of light?
