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प्रश्न
When light travels from a denser to a rarer medium, its speed ______.
उत्तर
When light travels from a denser to a rarer medium, its speed increases.
संबंधित प्रश्न
Write true or false of the following statement.
The speed of light in vacuum is 3 × 108 ms-1.
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
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.
Numerical problem.
Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Ans: 2 × 108 ms–1)
Materials that are not able to allow light to pass through, are called ______ material.
Materials that allow light to pass through completely are known as transparent materials.
Define opaque material. Give example.
The speed of light decreases in a denser medium, light bends towards the normal.
Two medium with a refractive index of 1.31 & 1.50 is given. In which case
- The bending of light is more and
- speed of light is more.
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.
