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In a fraunhofer's diffraction by a slit,...

In a fraunhofer's diffraction by a slit, if slit width is a, wave length `lamda` focal length of lens is f, linear width of central maxima is-

A

`(flamda)/(a)`

B

`(fa)/(lamda)`

C

`(2flamda)/(a)`

D

`(flamda)/(2a)`

Text Solution

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The correct Answer is:
C
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ALLEN -WAVE OPTICS-Exercise 1 (Check your Grasp)
  1. In single slit fraunhoffer diffraction which type of wavefront is requ...

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  2. In the diffraction pattern of a single slit aperture, the width of the...

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  3. Central fringe obtained in diffraction pattern due to a single slit-

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  4. In a single slit diffraction pattern, if the light source is used of l...

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  5. In the laboratory, diffraction of light by a single slit is being obse...

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  6. Find the half angular width of the central bright maximum in the fraun...

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  7. In a fraunhofer's diffraction by a slit, if slit width is a, wave leng...

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  8. In a fraunhofer's diffraction obtained by a single slit aperture, the ...

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  9. A polariser in used to

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  10. Light waves can be polarised as they are

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  11. Through which character we can distiguish the light waves from sound w...

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  12. The angle of polarisation for any medium is 60^(@), what will be the c...

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  13. The angle of incidence at which reflected light totally polarised for ...

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  14. A polaroid is placed at 45^@ to an incoming light of intensity I0. Now...

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  15. Plane polarised light is passed through a polaroid. On viewing through...

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  16. A ray of light is incident on the surface of a glass plate at an angle...

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  17. A beam of light strikes a glass plate at an angle of incident 60^(@) a...

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  18. Polarised glass is used in sun glasses because:

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  19. When unpolarised light beam is incident from air into glass (n =1.5) a...

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  20. When the angle of incidence on a material is 60^(@), the reflected lig...

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