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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

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

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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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Answer the following questions: Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other

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

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Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction

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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Answer the following questions: When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible

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

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Answer the following questions: As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this

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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When light travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a decrease in the energy carried by the light wave? Justify your

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

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What type of wavefront will emerge from a (i) point source (ii) distant light

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

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Draw a diagram to show refraction of a plane wavefront incident on a convex lens and hence draw the refracted

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

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Differentiate between a ray and a

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

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Draw the wavefront coming out from a convex lens, when a point source of light is placed at its

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

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