Read the following passage and answer the following questions:-
Mirrors have been used for ages. It is said that Archimedes used huge mirrors to focus the heat of the sun’s rays on enemy ships to burn them. The same principle is used in solar cookers where mirrors are used to reflect and focus the sun’s rays on to cooking containers. Astronomers use huge concave mirrors to focus starlight. The mirrors used in telescopes are polished by giving a thin coat of silver or aluminium to the glass. With the telescopes, astronomers can see the heavenly bodies but even without the telescopes, one can see the moon. A full moon shining overhead is a beautiful sight. But it is also a puzzle because if the sun and the moon both give the same sunlight, then why is the moonlight more pleasant? The reason is that the moon reflects very little sunlight, in fact, only seven per cent of the light it receives. The earth reflects about half of the radiation that it receives from the sun. Imagine how bright the earth must be looking from the moon? One can even read a book on the moon in the earthlight. However, you do not have to travel all the way to the moon to realize how strong the earthlight is. Observe the crescent moon soon after all the new moon. The bright crescent is illuminated by the sun. The rest of the moon is illuminated by earthlight.
In other words, the light reflected by the earth is falling on the moon. This is being reflected back to us and is strong enough to show the moon faintly. As the crescent increases in size, this effect disappears.
Fresh snow is the best reflector of sunlight in nature. As a highly reflective substance, snow dramatically increases UV-B exposure near the Earth’s surface as it reflects most of the radiation back into the atmosphere where it is then scattered back towards the surface by aerosols and molecules. Fresh snow can reflect much as 9.4 per cent of the incoming UV radiation. The bright light reflected by it can dazzle and harm your eyes. Mountaineers, therefore, use dark glasses.
(a) Archimedes used mirrors to focus the heat of the sun’s rays to————
(b) Mirrors used in telescopes are polished by giving the glass a thin coat of————
(c) The principle of focusing the sun’s rays is used in————-
(d) The bright light reflected by fresh snow can————–
(e) The earth reflects ———–the radiation received from the sun.
(f) The moon absorbs most of the light it receives and reflects only ————-
(g) The dim part of the crescent moon is lighted by————
(h) Mountaineers wear ————while climbing mountains.
Ans : (a) burn the ships of the enemies
(b) silver or aluminium
(c) solar cookers
(d) dazzle and harm your eyes
(e) about half of
(f) seven per cent of the light it receives
(h) dark glasses
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