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प्रश्न
What is a rainbow?
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उत्तर
- The rainbow is an arch of seven colours visible in the sky, which is produced by the dispersion of the sun’s light by raindrops in the atmosphere.
- A rainbow is produced by the dispersion of white sunlight by raindrops (or water drops) in the atmosphere. Each raindrop acts as a tiny glass prism, splitting the sunlight into a spectrum.
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संबंधित प्रश्न
Draw a ray diagram to explain the term angle of deviation.
Draw a ray diagram to show the dispersion of white light.
As light rays pass from air into a glass prism, are they refracted towards or away from the normal?
In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen.
Why do different colours of white light bend through different angles with respect to the incident beam of light?
Make two diagrams to explain refraction and dispersion.
What acts as tiny prisms in the formation of a rainbow?
The splitting up of white light into seven colours on passing through a glass prism is called ______.
The property of splitting of white light into its seven constituent colours is known as
How does the speed of light determine the optical density of a medium?
Explain briefly, with the help of a neat labelled diagram, how white light gets dispersed by a prism. On which surface of a prism, there is both dispersion and deviation of light, and on which surface of the prism, there is only deviation of light ?
When a white light ray falls on a prism, the ray at its first surface suffers ______.
The frequency range of visible light is from 3.75 × 1014 Hz to 7.5 × 1014 Hz. Calculate its wavelength range. Take speed of light = 3 × 108 m/s.
In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ?
An object AB is placed in front of a convex lens as shown in fig. 4. Complete the ray diagram and obtain the image formed and state the nature of the image.
How can the presence of ultraviolet radiation be detected?
State two properties of ultraviolet radiation which differ from visible light.
The process of separation of light into its component colours while passing through a medium is called _______.
When white light enters a glass prism from the air, the angle of deviation is least for ____________.
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
When sunlight passes through water droplets in the atmosphere it gets dispersed into its constituent colours forming a rainbow. A similar phenomenon is observed when white light passes through a prism.
Instead of sunlight, a green-coloured ray is passed through a glass prism. What will be the colour of the emergent ray?
