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प्रश्न
Why are traffic signals red in colour?
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उत्तर
- The wavelength of red colour is more than other colours.
- Red colour will travel long distance without scattering.
- Red colour gets least scattered and reaches people.
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संबंधित प्रश्न
Match the following
| (a). A light ray passes from air to glass | (1) . speeds up |
| (b). A light ray passes from glass to water | (2). reflects red light |
| (c). Virtual image | (3). primary colours |
| (d). Red rose | (4). plane mirror |
| (e). Red, green, and blue | (5). slows down |
Write true or false of the following statement.
A shadow is formed because light travels in a straight-line path.
What do we call a substance through which we cannot see light? Give an example of such a substance.
Why do objects in a room become visible even if sunlight does not enter it?
From among the following objects, list out the opaque, translucent, and transparent bodies in the space provided below:
A glass strip, an ordinary paper, greased paper, tracing paper, polythene sheet, wooden piece, steel plate, glycerine, kerosene oil, mustard oil, grounded glass, stone, book, water, and milk.
Opaque Transparent Translucent
Fill in the blank
The brightness of light is measured in ...................
When a beam of white light passes through a prism it gets ______.
The angle of deviation of light ray in a prism depends on the angle of ______.
Velocity of light is greater in denser medium than in rarer medium
What happens to light when it gets dispersed? Give an example.
