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An infinitely long cylinder of radius R is made of an unusual exotic material with refractive index –1 (Fig). The cylinder is placed between two planes whose normals are along the y direction. The center of the cylinder O lies along the y-axis. A narrow laser beam is directed along the y direction from the lower plate. The laser source is at a horizontal distance x from the diameter in the y direction. Find the range of x such that light emitted from the lower plane does not reach the upper

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

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Consider a thin lens placed between a source (S) and an observer (O) (Fig.). Let the thickness of the lens vary as `w(b)=w_0-b^2/a`, where b is the verticle distance from the pole. w0 is a constant. Using Fermat’s principle i.e. the time of transit for a ray between

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

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A gravitational lens may be assumed to have a varying width of the form Show that an observer will see an image of a point object as aring about the center of the lens with an angular radius`W(b)=k_1` ln `k_2/b`

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

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Assume that light of wavelength 6000Å is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100

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

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What is the Fresnel's distance? For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500

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

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Discuss the intensity of transmitted light when a polaroid sheet is rotated between two crossed

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

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Unpolarised light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to each

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

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Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of reflected, Refractive index of water is

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

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Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of refracted light? Refractive index of water is

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

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Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400

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

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The 6563 Å Hα line emitted by hydrogen in a star is found to be redshifted by 15 Å. Estimate the speed with which the star is receding from the

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

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Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with

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

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You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the

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

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Let us list some of the factors, which could possibly influence the speed of wave propagation: (i) nature of the source. (ii) direction of propagation. (iii) motion of the source and/or observer. (iv) wavelength. (v) intensity of the wave. On which of these factors, if any,

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

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For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and (ii) source moving; observer at rest. The exact Doppler formulas for the case of light waves in vacuum are, however, strictly identical for these situations. Explain why this should be so. Would you expect the formulas to be strictly identical for the two situations in case of light travelling in a

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

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In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1°. What is the spacing between the two

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

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Answer the following questions: In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction

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

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Answer the following questions: In what way is diffraction from each slit related to the interference pattern in a double-slit

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Answer the following questions: When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain

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

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Answer the following questions: Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse

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

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