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What is the shape of the wavefront in ea...

What is the shape of the wavefront in each of the following cases ?
(a) light diverging from point source.
(b) light emerging out of a convex lens when a point source is placed at its focus.
( c) the portion of the wavefront of light from a distant star intercepted by earth.

Text Solution

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(a) Spherical
(b) Plane
(c) Plane (a small area on the surface of a large sphere is nearly planar).
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NCERT TAMIL-WAVE OPTICS-EXERCISES
  1. Monochromatic light of wvalength 589 nm is incident from air on a wate...

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  2. What is the shape of the wavefront in each of the following cases ? ...

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  3. (a) The refractive index of glass is 1.5. What is the speed of light i...

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  4. In a Young's double-slit experiment , the slits are separated by 0.28 ...

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  5. In Young's double slit experiment using monochromatic light of wavelen...

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  6. A beam of light consisting of two wavelengths 650 nm and 520 nm is use...

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  7. In a double slit experiment the angular width of a fringe is found to ...

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  8. What is Brewster angle for air to glass transtion ? (mu of glass is 1....

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

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  10. Estimate the distance for which for which ray optics is good approxima...

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  11. The 6563 Å H(2) line emitted by hydrogen in a star is found to be red ...

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

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

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  14. Let us list some of the factors, which could possibly infuence the spe...

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  15. For sound waves, the Doppler's formula for frequency shift differs sli...

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

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  17. In a single slit diffraction experiment, the width of the slit is made...

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

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

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

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