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प्रश्न
How could you show that the colours of the spectrum combine to give white light?
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उत्तर
We know that a spectrum of colours is formed when a beam of white light is passed through a transparent glass prism. These colours can be recombined to give white light again. This is achieved by placing another glass prism upside down behind the first prism. A patch of white light is obtained on a screen placed behind the second prism because the refraction produced by the second prism is equal and opposite to the refraction produced by the first prism.
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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
Fill in the blank with suitable word:
When a ray of light enters a prism, it bends ................ the normal ; as it leaves the prism, it bends ................. the normal.
What will happen if another similar glass prism is placed upside down behind the first prism?
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?
Name the process which is involved in the formation of a rainbow.
The splitting up of white light into seven colours on passing through a glass prism is called:
(a) refraction
(b) deflection
(c) dispersion
(d) scattering
When white light passes through a prism, it ............
A ray of light moving from an optically rarer to a denser medium
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
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.
Complete the ray diagram given below to show the nature of light produced on the screen.
The completed ray diagram is as shown below:
Draw a labelled diagram: Dispersion of light through a prism.
Write the range of wavelength of the visible spectrum.
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
The phenomena of light involved in the formation of rainbow are ______.
Which one of the following is involved for the formation of rainbow in the sky?
______ colour is deviated the least in the spectrum of white light obtained with a glass prism.
The dispersive powers of flint glass and crown glass are 0.053 and 0.034, respectively and their mean refractive indices are 1.68 and 1.53 for white light. Calculate the angle of the flint glass prism required to form an achromatic combination with a crown glass prism of refracting angle 4°:
dispersive power of crown glass? Given that µv = 1.5230, µr = 1.5145
State True or False:
"Wavelength of red light is close to 700 nm.”
