Rainbow is formed when white light coming from the sun undergoes;

1. refraction
2. reflection
3. dispersion
4. all of these
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Answer: D
Explanation:
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Rainbow is formed due to;

1. spectrum of white light
2. reflection of light
3. electromagnetic nature of light
4. small size of rain drops
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Answer: A
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The velocity of photon is

1. Independent of its wavelength
2. depends on its wavelength
3. Equal to its square of amplitude
4. depends on its source
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Answer: A
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Rainbow is anxample of:

1. line spectrum
2. atomic spectrum
3. continuous spectrum
4. none of these
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Answer: C
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Visible light has wavelength range:

1. 200 - 4000 nm
2. 800 - 12000 nm
3. 10 - 400 nm
4. 400 -800 nm
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Answer: D
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If the different colours of a spectrum cannot be marked, then it is called:

1. line spectrum
2. atomic spectrum
3. continuous spectrum
4. none of these
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Answer: C
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Which colour appears as outer side of an arc in rainbow:

1. red
2. green
3. yellow
4. violet
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Answer: A
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Which colour appears as inner side of an arc in rainbow:

1. red
2. green
3. yellow
4. violet
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Answer: D
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Which component of white light is delected at larger angle after passing through prism?

1. red colour
2. orange colour
3. violet colour
4. Blue colour
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Answer: C
Explanation:
• Violet colour has shorter wavelength, so shows greater deflection
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Which component of white light is delected at smaller angle after passing through prism?

1. red colour
2. orange colour
3. violet colour
4. Blue colour
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Answer: A
Explanation:
• red colour has greater wavelength, so shows small deflection
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