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Science (Sec 1)
Light (Chapter 5)
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Properties of light
-Light is a form of energy.
-Light always travels along a straight line.
-Light travels at a speed of 3 x 10^8m/s in a vacuum
-Light can be reflected/refracted
Reflection of light
-Bounces
off light rays of a surface
-Laws
of reflection of light
~
Incident
ray, reflected ray and normal must lie on the same plane
~
Angle
of incidence=
Angle
of reflection
Characteristics of image formed in a plane mirror
Virtual
Same size as object
Laterally inverted
Upright
Same distance as the object from the mirror
Refraction
-Refraction is the
change
in
direction
of the light ray passing from one medium to another caused by its
change
in
speed
-Laws of refraction
~
Incident
ray,
reflected ray
and
normal
must lie on the same
plane
~Sin i/Sin r =
Formula
of
refractive index
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