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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

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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

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

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Differentiate between a ray and a

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

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Sketch the shape of wavefront emerging from a point source of light and also mark the

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Define a

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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

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

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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

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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

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

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