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प्रश्न
Air is optically .......... than glass.
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उत्तर
Air is optically rarer than glass.
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संबंधित प्रश्न
What is refraction of light?
| Column I | Column II | Column III | |
| 1 | Dispersion | Long-sightedness | Twinkling of stars |
| 2 | Refraction | Splitting of white light into component colours | Convex lens |
| 3 | Hypermetropia | Change in the direction of the ray of light due to change in medium | Spectrum of seven colours |
Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:
- Incident ray
- Point of incidence
- Normal
- Reflected ray
- Angle of incidence
- Angle of reflection
A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.
Fill in the following blank with suitable word:
Light bends when is passes from water into air. We say that it is ............
Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.
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.
What is atmospheric reflection? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position.
Twinkling of stars and Mirage are the two phenomena occurring due to refraction.
When a ray of light travels normal to the given surface, then the angle of refraction is ______.
