DISPERSION OF LIGHT
COMPOSITE LIGHT
Any light composed of two or more
colours is called a composite light
DISPERSION OF LIGHT
Splitting up of a composite light in
to its component colours is called Dispersion of light
NEWTON'S EXPERIMENT
Allow sunlight (To make a
narrow beam of light use a mirror and slit) to fall obliquely on the face
of a triangular glass prism.
On the other side we can observe
seven colours.Violet color seems near the base of prism.ie violet deviates more
and Red deviate less. From this we can conclude sunlight consist if seven
colours. So it is a composite light.
What are the colours formed on the
wall?
Violet, Indigo, Blue,Green, Yellow
,Orange ,Red (VIBGYOR). The orderly arrangement
of these colours is called Spectrum
Colour
wave length(nm)
Violet
400-440
Indigo
440-460
Blue
460-500
green
500-570
yellow
570-590
orange
590-620
red
620-700
Is there any connection
between wavelength and deviation of constituent colours?explain
Yes, When composite light enter from
air to prism(glass) there refraction take place.When light emerge out to air
from glass there is another refraction take place .According to change in wave
length refraction take place at different rates.. According to the difference
in wavelength the rate of deviation varies in each colour. The colour with
lowest wavelength deviates most. The colour with highest wavelength deviates
less.
Why the light of torch,
candle appears yellow instead of white, even though it contain same spectrum of
sunlight?
The intensity of blue color is
less in the light of candle and torch . So it appears in yellow.
CAN WE RECOMBINE THE
DISPERSED COLOURS IN THE WHITE LIGHT?
Yes, Arrange the two prisms as shown
in figure
RAINBOW
The sunlight that incident at a
suitable angle at the top of a water drop undergo two refraction and one total
internal reflection inside the water drop. So the white light split in to its
constituent colors.
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