Stars behave like ........ sources of li...

Stars behave like ........ sources of light and planets behave like ......... sources of light.

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A vessel is fully filled with liquid having refreactive index 5/3 . At the bottom of the vessel a point-like source of light is kept. An observer looks at the source of light from the top. Now, an opaque circular disc is kept on the surface of the water in such a way that its centre just rests above the light source. Now liquid is taken out from the bottom gradually. Calculate the maximum height ofthe liquid to be kept so that light source cannot be seen from outside. (Radius of the disc is 1 cm.)

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A LASER is a source of very intense, monochromatic, and unidirectional beam of light.These properties of a laser light can be exploited to measure long distance. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light . A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon's surface. How much is the radius of the lunar orbit around the Earth ?

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KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS(Fill in the blanks)

The type of image formed by the eye lens is ......... and .......
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A triangular glass prism has ......... triangular bases and ......... ...
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Light enters our eye through the .......
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A person suffering from far-sightedness or hypermetropia cannot see cl...
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A ......... corrective lens is used to rectify near-sightedness.
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An old person suffering from near-sightedness and a far-sightedness us...
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While passing through the prism the light ray travelling from air to g...
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In a glass prism ......... light propagates with maximum speed.
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At night stars are seen slightly at a higher position than their actua...
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For a light ray passing through the prism, the angle between the incid...
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At the time of sunrise the sun appears ........ in colour.
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The fine particles in air scatter ......... light more strongly.
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........ light, while passing through a prism, does not disperse.
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Stars behave like ........ sources of light and planets behave like .....
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Danger signals are red in colour because red light is ..........
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In the spectrum of white light, ……….. and ........ colours seen at the...
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The diameter of the human eyeball is approximately ..... . cm.
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The distance between the eye lens and the retina is known as the ........
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In the normal situation in the relaxed position of the ciliary muscles...
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At night as we move up in the atmosphere of the earth, the refractive ...
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