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

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

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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

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

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

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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

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

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(i) AJse Huygens' geometrical construction to show how a plane wavefront at t = 0 .propagates and produces a wavefront at a later time.(ii) Verify, using Huygens' principle, Snell's law of refraction of a plane wave propagating from a denser to a rarer medium.(iii) When monochromatic light is incident on a surface separation two media, the reflected and refracted light both have the same frequency. Explain

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

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State Huygens' principle. Using this principle draw a diagram to show how a plane wavefront incident at the interface of the two media gets refracted when it propagates from a rarer to a denser medium. Hence, verify Snqll's law of

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

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(i) A plane wavefront approaches a plane surface separating two media. If medium 1 is optically denser and medium 2 is optically rarer, using Huygens' principle, explain and show how a refracted wavefront is ^constructed?(ii) Verify Snell's law.(iii) When a light wave travels from a rarer to a denser medium, the speed decreases. Does it imply reduction in its energy?

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

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Define the term 'coherent sources' which are required to produce interference pattern in Young's double slit

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How would the angular separation of interference fringes in Young's double slit experiment change when the distance between the slits and screen is

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Why are coherent sources required to create interference of

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Laser light of wavelength 630 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 7.2 mm. Calculate the wavelength of another source of laser light which produce interference fringes separated by 8.1 mm using same pair of

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

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How will the interference pattern in Young's double slit experiment get affected, when(i) distance between the slits `S_1 and S_2` reduced and (ii) the entire set up is immersed in water? Justify your answer in each

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

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The figure shows a double slit experimental set up for observing interference fringes due to different interference component colours of white light. What would be the predominant colour of the fringes observed at the point.(i) O (the central point) (ii) P, where, `S_2P - S_1P =(lambda_b)/2` ? (here, `lambda_b` is the wavelength of the blue

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

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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

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

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