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Explanation:
1-Light is a key element in our everyday lives. It guides us throughout the day, nudging us to wake in the morning and lulling us to sleep at night. Well-appointed task lighting enhances our experience in the work place and adversely, a dimmed lamp can set the mood for a romantic dinner for two.
2-(a)Examples of luminous objects are:
the sun
flame in a lamp
tube light
electric bulb
Examples of non-luminous objects are:
the earth
moon
a piece of cloth
coal
(b)natural source of light
sun
stars
candles
artificial source of light
torch
light bulb
lamp posts
3-ray of light: in first picture
beam of light: in second picture
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