Chapter 16 – Optics
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The initial shape of the wave front of the beam is
18
Nov
The initial shape of the wave front of the beam is The initial shape of the wave front of the beam is November 18, 2020 Category: Chapter 16 - Optics , JEE Mains Physics 2002-2019 Solved Video Solutions ,
In a Young’s double slit experiment, the two slits act as coherent sources of waves of equal amplitude A and wavelength λ. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the screen in the first case is I1 and in the second case is I2, then the ratio I1/I2 is
18
Nov
In a Young’s double slit experiment, the two slits act as coherent sources of waves of equal amplitude A and wavelength λ. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the [...]
Statement – 1 : On viewing the clear blue portion of the sky through a Calcite Crystal, the intensity of transmitted light varies as the crystal is rotated. Statement – 2 : The light coming from the sky is polarized due to scattering of sun light by particles in the atmosphere. The scattering is largest for blue light
18
Nov
Statement – 1 : On viewing the clear blue portion of the sky through a Calcite Crystal, the intensity of transmitted light varies as the crystal is rotated. Statement – 2 : The light coming from the sky is polarized due to scattering of sun light by particles in the atmosphere. The scattering is largest [...]
At two points P and Q on a screen in Young’s double slit experiment, waves from slits S1 and S2 have a path difference of 0 and λ/4 respectively. The ratio of intensities at P and Q will be :
18
Nov
At two points P and Q on a screen in Young’s double slit experiment, waves from slits S1 and S2 have a path difference of 0 and λ/4 respectively. The ratio of intensities at P and Q will be : At two points P and Q on a screen in Young's double slit experiment waves [...]
In a Young’s double slit experiment, one of the slit is wider than other, so that amplitude of the light from one slit is double of that from other slit. If Im be the maximum intensity, the resultant intensity I when they interfere at phase difference ϕ, is given by
18
Nov
In a Young’s double slit experiment, one of the slit is wider than other, so that amplitude of the light from one slit is double of that from other slit. If Im be the maximum intensity, the resultant intensity I when they interfere at phase difference ϕ, is given by In a Young's double slit [...]
Two coherent point sources S1 and S2 are separated by a small distance d as shown. The fringes obtained on the screen will be
18
Nov
Two coherent point sources S1 and S2 are separated by a small distance d as shown. The fringes obtained on the screen will be Two coherent point sources S1 and S2 are separated by a small distance d as shown. The fringes obtained on the screen will be November 18, 2020 Category: Chapter 16 - [...]
A beam of unpolarized light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of the emergent light is
18
Nov
A beam of unpolarized light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of the emergent light is The speed of light in the medium is : November [...]
Two beams A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam a has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30∘ makes the two beams appear equally bright. If the initial intensities of the two beams are IA and IB respectively, then IA/IB equals:
18
Nov
Two beams A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam a has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30∘ makes the two beams appear equally bright. If the initial intensities of the [...]
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a rotation of polaroid through 30∘ makes the two beams appear equally bright. If the initial intensities of the two beams are IA and IB respectively ,
of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam a has maximum intensity (and beam B has zero intensity) ,
then IA/IB equals: ,
Two beams A and B ,
Assuming human pupil to have a radius of 0.25cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is
18
Nov
Assuming human pupil to have a radius of 0.25cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is Assuming human pupil to have a radius of 0.25cm and a comfortable viewing distance of 25 cm the minimum separation between two [...]
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say b min) when :
18
Nov
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and [...]