A transparent substance in which light travels is known as a medium. Air, glass, certain
plastics, water, kerosene, alcohol, etc., are all examples of medium. Different media are said
to have different optical densities. A medium in which the speed of light is more is known
as optically rarer medium. Air is an optically rarer medium as compared to glass and
water. A medium in which the speed of light is less, is known as optically denser
medium. Glass is an optically denser medium than air and water.
In comparing two media, the one with the larger refractive index is optically denser medium
than the other. The other medium of lower refractive index is optically rarer.
1x4
(i) Light travelling from a denser medium to a rarer medium along a normal to the boundary:
a) is refracted towards the normal
b) is refracted away from the normal
c) stopped at the boundary
d) is refracted along the normal
(ii) A ray of light passes from glass into air. The angle of refraction will be:
a) equal to the angle of incidence
b) greater than the angle of incidence
c) smaller than the angle of incidence
d) 45°
(iii) Which is optically denser air with refractive index 1.0003 or diamond with refractive
index 2.42.
(iv) A student studies that speed of light in air is 300000 kms/ sec where that of speed in a
glass slab is about 197000 kms/ sec. What causes the difference in speed of light in these
two media?
a) difference in density
b) difference in temperature
c) difference in amount of light
d) difference in direction of wind flow
(v) The refractive index of transparent medium is greater than one because
a) Speed of light in vacuum < speed of light in tansparent medium
b) Speed of light in vacuum > speed of light in tansparent medium
c) Speed flight in vacuum = speed of light in tansparent medium
d) Frequency of light wave changes when it moves from rarer to denser medium
20 Magnetic Field lines- The space surrounding a magnet in which magnetic force i
Answers
Explanation:
Quantum mechanics differs from classical physics in that energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values (quantization), objects have characteristics of both particles and waves (wave-particle duality), and there are limits to how accurately the value of a physical quantity can be predicted prior to its measurement, given a complete set of initial conditions (the uncertainty principle).[note 1]
Quantum mechanics arose gradually, from theories to explain observations which could not be reconciled with classical physics, such as Max Planck's solution in 1900 to the black-body radiation problem, and the correspondence between energy and frequency in Albert Einstein's 1905 paper which explained the photoelectric effect. Early quantum theory was profoundly re-conceived in the mid-1920s by Niels Bohr, Erwin Schrödinger, Werner Heisenberg, Max Born and others. The original interpretation of quantum mechanics is the Copenhagen interpretation, developed by Niels Bohr and Werner Heisenberg in Copenhagen during the 1920s. The modern theory is formulated in various specially developed mathematical formalisms. In one of them, a mathematical function, the wave function, provides information about the probability amplitude of energy, momentum, and other physical properties of a particle.
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