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प्रश्न
The phenomena of light involved in the formation of rainbow are ______.
Which of the following phenomena of light are involved in the formation of a rainbow?
विकल्प
Reflection, refraction and dispersion
Refraction, dispersion and total internal reflection
Refraction, dispersion and internal reflection
Dispersion, scattering and total internal reflection
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उत्तर
Refraction, dispersion and internal reflection
Explanation -
A rainbow is a natural spectrum of seven colours appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrop.
संबंधित प्रश्न
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
Why do the component colours of incident white light split into a spectrum while passing through a glass prism, explain
Study the following ray diagram:
In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by
(A) y, p, z
(B) x, q, z
(C) p, y, z
(D) p, z, y
In the formation of spectrum of white light by a prism:
which colour is deviated least?
Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark
(i) incident ray
(ii) emergent ray, and
(iii) angle of deviation.
Which of the following colour of white light is least deviated by the prism?
(a) green
(b) violet
(c) indigo
(d) yellow
A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.
In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ?
When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labelled ray diagram to illustrate it.
The wavelength range of white light is ______.
Differentiate between a glass slab and a glass prism.
A student has to trace the path of a ray of light through a glass prism. List four precautions he should observe for better results.
State two uses of ultraviolet radiation.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
State True or False:
"Wavelength of red light is close to 700 nm.”
A ray of light is incident at 45° on an equilateral prism in the diagram below.
- Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
- State the cause of the above phenomenon mentioned by you.
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?
