Optics HW Diffraction-Fraunhofer 19. Fraunhofer diffraction uses Huygens-Fresnel
ID: 2305791 • Letter: O
Question
Optics HW Diffraction-Fraunhofer 19. Fraunhofer diffraction uses Huygens-Fresnel principle a) True b) False 20. For a wave incident on a single slit the wave will cover all angles after the slit if the wavelength is much larger than the width of the slit. a) True b) False 21. For a wave incident on a single slit the wave will cover only mostly the forward direction after the slit if the wavelength is much less than the width of the slit. a) True b) False 22. One of the main results that Fraunhofer approximation gives us is the irradiance of a single slit. True b) False very far from the source. 23. In Fraunhofer diffraction the observation point must be a) True b) False 24. In Fraunhofer diffactionRExplanation / Answer
19. The statement is True.
Fresnel developed an equation using the Huygens wavelets together with theprinciple of superposition of waves, which models these diffraction effects quite well.
20. The statement is True.
When the wavelength is larger than the width of the slit, then the wave incident on a single slit covers all angles after the slit.
21. The statement is True.
When the wavelength is smaller than the width of the slit, then the wave incident on a single slit will cover mostly the forward direction after the slit. The spreading after the slit will be very low.
22. The statement is True.
Fraunhofer approximation provides the diffraction due to a single slit also.
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