PHYSICS CLASS- 12 OPTICS HANDWRITTEN NOTES PDF HERE
Aniket Ncert August 05, 2021
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PHYSICS CLASS- 12 OPTICS HANDWRITTEN NOTES PDF HERE:-
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The Dutch physicist Christiaan Huygens put forward the
wave theory of light – it is this wave model of light that we will discuss in
this chapter. As we will see, the wave model could satisfactorily explain
the phenomena of reflection and refraction; however, it predicted that on
refraction if the wave bends towards the normal then the speed of light
would be less in the second medium. This is in contradiction to the
prediction made by using the corpuscular model of light. It was much
later confirmed by experiments where it was shown that the speed of
light in water is less than the speed in air confirming the prediction of the
wave model; Foucault carried out this experiment in 1850.
In optical region, light has a wavelength of about half a micrometre. If it encounters an
obstacle of about this size, it can bend around it and can be seen on the other side. Thus a
micrometre size obstacle will not be able to stop a light ray. If the obstacle is much larger,
however, light will not be able to bend to that extent, and will not be seen on the other side.
Christiaan Huygens
(1629 – 1695) Dutch
physicist, astronomer,
mathematician and the
founder of the wave
theory of light. His book,
Treatise on light, makes
fascinating reading even
today. He brilliantly
explained the double
refraction shown by the
mineral calcite in this
work in addition to
reflection and refraction.
He was the first to
analyse circular and
simple harmonic motion
and designed and built
improved clocks and
telescopes. He discovered
the true geometry of saturn ring.
Thomas Young
(1773 – 1829) English
physicist, physician and
Egyptologist. Young worked
on a wide variety of
scientific problems, ranging
from the structure of the eye
and the mechanism of
vision to the decipherment
of the Rosetta stone. He
revived the wave theory of
light and recognised that
interference phenomena
provide proof of the wave
properties of light.
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