Advertisements
Advertisements
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
Advertisements
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
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.
State the colour seen (i) at X, and (ii) at Y.
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.
Name the process which is involved in the formation of a rainbow.
A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is:
(a) violet
(b) red
(c) green
(d) blue
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
A ray of light moving from an optically rarer to a denser medium
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.
A ray of white light is passed through a glass prism and a spectrum is obtained on a screen.
- Name the seven colours of the spectrum in order.
- 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?
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?
State two properties of ultra-violet radiations which differ from visible light.
Write the range of wavelength of the visible spectrum.
Sunlight entering through a narrow aperture falls on a prism. Draw a neat labelled ray diagram to show the formation of the spectrum on a screen. Name the colour obtained nearer the base of the prism.
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.
The splitting of white light in to seven colors is called ______.
The periscope is an optical device with a polished surface that reflects the light falling on it.
______ colour is deviated the least in the spectrum of white light obtained with a glass prism.
A prism of refractive index `sqrt2` and refracting angle A produces minimum deviation δm of a ray on one face at an angle of incidence 45°, The values of A and δm are, respectively ______.
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
