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Question
What are the seven colours seen in a rainbow?
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Solution
The seven colours seen in a rainbow are red, orange, yellow, green, blue, indigo and violet.
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RELATED QUESTIONS
Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are
(a) ∠A and ∠i
(b) ∠A, ∠i and ∠r
(c) ∠A, ∠i, ∠e and ∠D
(d) ∠A, ∠i, ∠r and ∠D
What acts as tiny prisms in the formation of a rainbow?
The colour of white light which is deviated the maximum on passing through the glass prism is:
(a) blue
(b) indigo
(c) red
(d) orange
In figure AO is the ray of white light falling on a prism PQR. Complete the diagram till the light emerges out from the prism and falls on the screen.
What do you understand by the term spectrum? Name the various colours present in the spectrum of sunlight.
A ray of white light is passed through a glass prism and a spectrum is obtained on a screen.
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- Do the colours have the same width in the spectrum?
- Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least?
When a white light ray falls on a prism, the ray at its first surface suffers ______.
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
A glass prism is able to produce the spectrum when white light passes through it, but a glass slab doesn’t produce any spectrum. Explain why it is so.
Complete the ray diagram given below to show the nature of light produced on the screen.
The completed ray diagram is as shown below:
Make the correct choice for each of the following:
Which one of the following Fig correctly shows the path of the ray through the glass block?
A wave has wavelength 50Å of State the speed in vacuum.
Distinguish between an impure spectrum and a pure spectrum.
Write the range of wavelength of the ultraviolet spectrum.
In the figure, a beam of light consisting of three colours blue, red, and yellow is incident on a prism and on a rectangular glass block respectively. Complete the diagram by drawings of the refracted and emergent rays.
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Make a rainbow
Try to make your own rainbow. You can try this project in the morning or in the evening. Stand with your back towards the Sun. Take a hosepipe or a water pipe used in the garden. Make a fine spray in front of you. You can see different colours of rainbow in the spray.
