TOPIC 4: NATURE AND REFLECTION OF LIGHT – PHYSICS FORM TWO
Light is an invisible form of energy that causes the sensation of vision in us through eyes
SOURCES OF LIGHT
Sources of light is the original or initial of light in which the light are comes from whether natural or artificial
TYPES OF SOURCES OF LIGHT
i. Natural sources of light. Example, sun, star and lighting
ii. Artificial sources of light. For Example, torch, candle, kerosene lamp etc
Properties of Light
i. Light radiates (spread out) from its source
ii. Light travels in straight lines
iii. Light transfers energy. Object gain energy when they absorb light. For Example, solar cells(panel)
iv. Light travels in vacuum
v. Light travels at the fasters speed, about 300,000,000 m/s
NB:
i. All objects which give out its own light is called luminous object. e.g. star, sun, torch, candle, electric bulb etc
ii. All objects that do not emit their own light instead became visible when they reflect light from another source is called non luminous objects. E.g. moon
iii. All objects that emit light as a result of being heated are called incandescent object. e.g. light bulb, fire flame, candle flame etc
iv. The spreading of light from its source to the environment in straight lines is referred as rectilinear propagation of light
PROPAGATION OF LIGHT
Since a light travel in a straight line, the path travel and by a light is called Ray. More than one rays is called beam.
TOPIC 4: NATURE AND REFLECTION OF LIGHT – PHYSICS FORM TWO
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