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A laser light beam of power 20 mW is focused on a target by a lens of focal length 0.05 m. If the aperture of the laser be 1 mm and the wavelength of its light 7000 A, calculate the angular spread
10
Sep
A laser light beam of power 20 mW is focused on a target by a lens of focal length 0.05 m. If the aperture of the laser be 1 mm and the wavelength of its light 7000 A, calculate the angular spread A laser light beam of power 20 mW is focused on a target [...]
Two balls are thrown horizontally from the top of a tower with velocities v1 and v2 in opposite directions at the same time. After how much time, the angle between velocities of balls becomes 90?
10
Sep
Two balls are thrown horizontally from the top of a tower with velocities v1 and v2 in opposite directions at the same time. After how much time, the angle between velocities of balls becomes 90? the angle between velocities of balls becomes 90? Two balls are thrown horizontally from the top of a tower with [...]
Two polaroids are crossed to each other. Now, one of them is rotated through 60. What percentage of incident unpolarized light will pass through the system?
10
Sep
Two polaroids are crossed to each other. Now, one of them is rotated through 60. What percentage of incident unpolarized light will pass through the system? one of them is rotated through 60. What percentage of incident unpolarized light will pass through the system? Two polaroids are crossed to each other. Now September 10, 2020 [...]
Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the transmitted light is
10
Sep
Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the transmitted light is Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the [...]
Two stones are projected so as to reach the same distance from the point of projection on a horizontal surface. The maximum height reached by one exceeds the other by an amount equal to half the sum of the heights attained by them. Then the angles of projection for the stones are (in degrees)
10
Sep
Two stones are projected so as to reach the same distance from the point of projection on a horizontal surface. The maximum height reached by one exceeds the other by an amount equal to half the sum of the heights attained by them. Then the angles of projection for the stones are (in degrees) A [...]
Light from an ordinary source (say a sodium lamp) is passed through a polarized sheet P1. The transmitted light is then made to pass through a second polaroid sheet P2 which can be rotated so that
10
Sep
Light from an ordinary source (say a sodium lamp) is passed through a polarized sheet P1. The transmitted light is then made to pass through a second polaroid sheet P2 which can be rotated so that Light from an ordinary source (say a sodium lamp) is passed through a polarized sheet P1. The transmitted light [...]
A polaroid examines two adjacent plane-polarized light beams A and B whose planes of polarization are mutually at right angles. In one position of the polaroid, the beam B shows zero intensity.
10
Sep
A polaroid examines two adjacent plane-polarized light beams A and B whose planes of polarization are mutually at right angles. In one position of the polaroid, the beam B shows zero intensity. A polaroid examines two adjacent plane-polarized light beams A and B whose planes of polarization are mutually at right angles. In one position [...]
The critical angle between a given transparent medium and air is denoted by C. A ray of light in air medium enters this transparent medium at an angle of incidence equal to polarizing angle
10
Sep
The critical angle between a given transparent medium and air is denoted by C. A ray of light in air medium enters this transparent medium at an angle of incidence equal to polarizing angle The critical angle between a given transparent medium and air is denoted by C. A ray of light in air medium [...]
Calculate the smallest angular separation resolved by the human eye. Given: Aperture a = 2.5 mm and effective lemda = 5500 A. If a scale with mm markings is viewed by the unaided eye
10
Sep
Calculate the smallest angular separation resolved by the human eye. Given: Aperture a = 2.5 mm and effective lemda = 5500 A. If a scale with mm markings is viewed by the unaided eye Calculate the smallest angular separation resolved by the human eye. Given: Aperture a = 2.5 mm and effective lemda = 5500 [...]
Two stars at a distance of 10 light years are viewed through a telescope having a lens of 20 cm diameter. What is the minimum separation of these stars for which they would be distinguishable
10
Sep
Two stars at a distance of 10 light years are viewed through a telescope having a lens of 20 cm diameter. What is the minimum separation of these stars for which they would be distinguishable Two stars at a distance of 10 light years are viewed through a telescope having a lens of 20 cm [...]