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What are the conditions to get pure spectrum?

Important Questions on Spectrum

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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
The order of wavelength of visible rays is
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
The correct arrangement of colors in the descending order of their wavelength
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
How does the angle of deviation formed by a prism change with the increase in the angle of incidence? Draw a graph showing the variation in the angle of deviation with the angle of incidence at a prism surface.
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
Which colour of the light has the longest wavelength?
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
A laser device produces amplification in the
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
Which of the following is not a correct statement?
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
The range of wavelength of visible light is
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
For LED's to emit light in visible region of electromagnetic radiation, it should have energy band gap in the range of
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
When white light is incident on the surface of an equiangular triangular prism, _____ colour is deviated the most.
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism

A hollow cylindrical beam of white light is incident on a converging lens in air. Axis of the beam coincides with the principle axis of the lens. A screen is placed behind the lens. If f v is focal length for violet light and f R is focal length for red light, then

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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
Two stars appear to be red and blue, what is true atbout them -
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
The colour of light is determined by
MEDIUM
Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
If nR and nV denote the number of photons emitted by a red bulb and violet bulb of equal power in a given time, then
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism

Assertion: The colour of the light can be assessed from the wavelength of light waves.

Reason: Intensity $=(\text { Amplitude })^{2}$.

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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
The deviation produced by a prism depends on the material, angle of incidence and angle of _____.
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
A star is continuously moving away from us. Then, the wavelength coming from star on the earth,
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
If λv, λx and λm represent the wavelengths of visible light, X-rays and microwaves respectively, then -
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
Nano size of gold has _____ colour
 
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
Source of illumination for image formation in dark field microscope is:
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Science>Physics>Spectrum>Deviation Produced by a Triangular Prism
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, then the beam which passes through the prism is _____ to the base of the prism.