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Answer the following questions: (c) Wh...

Answer the following questions:
(c) 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 why?

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Waves diffracted from the edge of the circular obstacle interfere constructively at the centre of the shadow producing a bright spot.
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Assertion (A) : When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the center of the shadow of the obstacle. Reason (R ) : Destructive interference occurs at the centre of the shadow.

Answer the following questions: (e) 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 properties of images in optical instruments. What is the justification?

Answer the following questions: (e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?

(a) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain why? (b) When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave? (c) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity of light in the photon picture of light

A small particle of mass m is fixed to the perimeter of a ring of same mass and radius r. The system comprising of particle and ring is placed on a horizontal plane. Friction is negligible on horizontal plane. Initially particle is at top most point, then the system is released from rest. Answer next two question when the particle is at the same height as the centre of ring aftr being released from top most point. Assume that the ring stays in vertical plane during its motion under consideration Mark the CORRECT option(s):

A small particle of mass m is fixed to the perimeter of a ring of same mass and radius r. The system comprising of particle and ring is placed on a horizontal plane. Friction is negligible on horizontal plane. Initially particle is at top most point, then the system is released from rest. Answer next two question when the particle is at the same height as the centre of ring aftr being released from top most point. Assume that the ring stays in vertical plane during its motion under consideration Mark the CORRECT option(s):-

Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density electric field, drift speed ? (b) Is Ohm's law universally applicable for all cnducting elements ? If not, give examples of elements which do not obey Ohm's law. (c ) A low voltage suply from which one needs high currents must have very low internal resistance.Why (d) A high tension (HT) supply of say, 6kV must have a very large internal resistance, Why ?

NCERT GUJARATI-WAVE OPTICS-EXERCISES
  1. In a double-slit experiment the angular width of a fringe is found to ...

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  2. What is the Brewster angle for air to glass transition? (Refractive in...

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  3. Light of wavelength 5000 Å falls on a plane reflecting surface. What a...

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  4. Estimate the distance for which ray optics is good approximation for a...

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  5. The 6563Å Halpha line emitted by hydrogen in a star is found to be red...

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  6. Explain how Corpuscular theory predicts the speed of light in a medium...

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  7. You have learnt in the text how Huygens’ principle leads to the laws o...

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  8. Let us list some of the factors, which could possibly influence the sp...

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  9. For sound waves, the Doppler formula for frequency shift differs sligh...

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  10. In double-slit experiment using light of wavelength 600 nm, the angula...

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  11. Answer the following questions: (a) In a single slit diffraction exp...

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  12. Answer the following questions: (b) In what way is diffraction from ...

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  13. Answer the following questions: (c) When a tiny circular obstacle is...

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  14. Answer the following questions: (d) Two students are separated by a ...

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  15. Answer the following questions: (e) Ray optics is based on the assum...

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  16. Two towers on top of two hills are 40 km apart. The line joining them ...

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  17. A parallel beam of light of wavelength 500 nm falls on a narrow slit a...

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  18. Answer the following questions: (a) When a low flying aircraft passe...

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  19. Answer the following questions: (b) As you have learnt in the text, ...

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  20. In deriving the single slit diffraction pattern, it was stated that th...

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