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Unpolarised light of intensity `I` is passed through a polaroid. What is the intensity of the light transmitted by the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find an expression for intensity of transmitted light, when a polaroid sheet is rotated between two crossed polaroids. In which position of the Polaroid sheet will the transmitted intensity be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a single slit of width a, the first minimum of the interference pattern of `a `monochromatic light of wavelength `lambda`, occurs at an angle of `lambda//a`. At the same angle of `lambda//a`, we get a maximum for two narrow slits separated by a distance `a`.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Calculate the width of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Yellow light `(lambda, = 6000 A^o)` illuminates a single slit of width `1xx10^(-4)m`. Calculate the distance between two dark lines on either side to the central maximum, when the diffraction pattern is viewed on a screen kept 1.5 m away from the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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State briefly two features which can distinguish the characteristic features of an interference pattern from those observed in the diffraction pattern due to a single

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a single slit diffraction experiment, a monochromatic source of light of wavelength `lambda` illuminates a narrow slit of width `a.` Show giving appropriate reasoning, that the half angular width of the central maximum in the observed pattern is (nearly) equal to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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State clearly how an unpolarised light get linearly polarised, when passed through a polaroid. (i) Unpolarised light of intensity `I_0` is incident on a polaroid `P_1` which is kept near polaroid `P_2` whose pass axis is parallel to that of `P_1`. How will the intensities of light, `I_1 and I_2` transmitted by the polaroids `P_1 and P_2` respectively, change on rotating `P_1` without disturbing `P_2` ? (ii) Write the relation between the intensities `I_1 and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Is Huygen’s principle valid for longitudunal sound

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the shape of the wavefront on earth for

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Why is the diffraction of sound waves more evident in daily experience than that of light

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The human eye has an approximate angular resolution of `φ = 5.8 × 10^(-4)` rad and a typical photoprinter prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance z should a printed page be held so that one does not see the individual

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A polariod (I) is placed in front of a monochromatic source. Another polatiod (II) is placed in front of this polaroid (I) and rotated till no light passes. A third polaroid (III) is now placed in between (I) and (II). In this case, will light emerge from (II).

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For the same objective, find the ratio of the least separation between two points to be distinguished by a microscope for light of 5000 A o and electrons accelerated through 100V used as the illuminating

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a two slit interference arrangements (Fig. ) such that the distance of the screen from the slits is half the distance between the slits. Obtain the value of D in terms of λ such that the first minima on the screen falls at a distance D from the centre

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Fig. shown a two slit arrangement with a source which emits unpolarised light. P is a polariser with axis whose direction is not given. If `I_0` is the intensity of the principal maxima when no polariser is present, calculate in the present case, the intensity of the principal maxima as well as of the first

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A small transparent slab containing material of μ = 1.5 is placed along AS2 (Fig.). What will be the distance from O of the principal maxima and of the first minima on either side of the principal maxima obtained in the absence of the glass slab.AC = CO = D, S1C = S2C = d <<

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Four identical monochromatic sources A,B,C,D as shown in the (Fig.) produce waves of the same wavelength λ and are coherent. Two receiver R1 and R2 are at great but equal distaces from B. Which of the two receivers picks up the larger

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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