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A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a _____.

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Important Questions on Optics

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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 22
'The stars seem to be higher on the sky than they actually are'. This can be explained by _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 23
Yellow colour is used as fog light because yellow colour _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 24
The mirror used for the head light of a car is _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 25
Soap bubble looks coloured due to _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 26
A star is emitting yellow light. If it is accelerated towards earth, then to an observer on earth, it will appear _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 27
What should be refractive index of a transparent medium to be invisible in vacuum?
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 28
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of _____.
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General Science for Competitive Exams>Chapter 5 - Optics>EXERCISE>Q 29

Smoke emerging from a campfire at the bottom of a hill is being observed by a person at some distance, as shown in the figure. It is evening, and the sun has just set behind the hill. Consider regions I and II of the smoke going up the sky.

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