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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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Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in Fig. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the

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

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Consider sunlight incident on a slit of width 104 A. The image seen through the slit

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

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Consider a ray of light incident from air onto a slab of glass (refractive index n) of width d, at an angle θ. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is

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

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In a Young’s double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this

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

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Fig. shows a standard two slit arrangement with slits S1, S2. P1, P2 are the two minima points on either side of P (Fig. ). At P2 on the screen, there is a hole and behind P2 is a second 2- slit arrangement with slits S3, S4 and a second screen behind

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

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Two source `S_1` and `S_2` of intensity `I_1` and `I_1` are placed in front of a screen [Fig. (a)]. The patteren of intensity distribution seen in the central portion is given by Fig. (b). In this case which of the following statements are true.

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

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Consider sunlight incident on a pinhole of width 103A. The image of the pinhole seen on a screen shall

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

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Consider the diffraction patern for a small pinhole. As the size of the hole is

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

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For light diverging from a point

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Is Huygen’s principle valid for longitudunal sound

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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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