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A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650

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

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A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. What is the least distance from the central maximum where the bright fringes due to both the wavelengths

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

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In a double-slit experiment the angular width of a fringe is found to be 0.2° on a screen placed 1 m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water? Take refractive index of water to be

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

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What is the Brewster angle for air to glass transition? (Refractive index of glass =

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Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident

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. Find the width of the

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

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In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angles of nλ/a. Justify this by suitably dividing the slit to bring out the

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

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(i) In a double slit experiment using ight of wavelength 600 nm, the angular width of the fringe formed on a distant screen is 0.1°. Find the spacing between the two slits.(ii) Linght of wavelength `5000A^o` propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the reflected and refracted light be

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Use Huygens' principle to show how a plane wavefront propagates from a denser to rarer medium. Hence, verify Snell's law of

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

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Define a wavefront. Use Huygens' geometrical construction to show the propagation of plane wavefront from a rarer medium (1) to a denser medium (2) undergoing refraction, hence derive Snell's law of

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

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(i) Use Huygens' geometrical construction to show the behaviour of a plane wavefront, (a) passing through a biconvex lens (b) reflected by a concave mirror. (ii) When monochromatic light is incident on a surface separating two media, why does the refracted light have the same frequency as that of the incident

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Using Huygens' geometrical construction of wavefronts, show how a plane wave gets reflected from a surface. Hence, verify laws of

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Use Huygens' principle to verify the laws of

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Using Huygens' principle, draw a diagram showing how a plane wave gets refracted, when it is incident on the surface separating a rarer medium from a denser medium. Hence, verify Snell's laws of

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

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(i) Using Huygens' construction of secondary wavelets explain how a diffraction pattern is obtained on a screen due to a narrow slit on which a monochromatic beam of light is incident normally.(ii) Show that the angular width of the irst diffraction fringe is half that of the central fringe.(iii) Explain why the maxima at `theta=(n+1/2)lambda/a` become weaker and weaker with increasing

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(a) Two monochromatic waves emanating from two coherent sources have the displacements represented by `Y_1 = a cosomegat` and `Y_2 = a cos(omegat+phi)`, where `(phi)` is the phase difference between the two waves. Show that the resultant intensity at a point due to their superposition is given by `I =4I_0cos^2 phi//2`, where `I_0 = a^2`. (b) Hence, obtain the conditions for constructive and destructive

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Describe Young's double slit experiment to produce interference pattern due to a monochromatic source of light. Deduce the expression for the fringe

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The intensity at the central maxima `(O)` in a Young's double slit experiment is `I_0` . If the distance OP equals one-third of fringe width of the pattern, then show that the intensity at point P would be `I_0

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

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In Young's double slit experiment, the two slits 0.15 mm apart are illuminated by monochromatic light of wavelength 450 nm. The screen is 1.0 m away from the slits. (i) Find the distance of the second (a) bright fringe(b) dark fringe from the central maximum. (ii) How will the fringe pattern change if the screen is moved away from the

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A beam of light consisting of two wavelengths 560 nm and 420 nm is used to obtain interference fringes in a Young's double slit experiment. Find the least distance from the central maximum, where the bright fringes, due to both the wavelengths coincide. The distance between the two slits is 4.0 mm and the screen is at a distance of 1.0 m from the

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

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