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(a) Why do we not encounter diffraction effects of light in everyday observations? (b) In the observed diffraction pattern due to a single slit, how will the width of central maximum be affected if (i) the width of the slit is doubled; (ii) the wavelength of the light used is increased? Justify your answer in each case. |
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Answer» (a) We do not encounter diffraction effects of light in everyday observations. To observe diffraction, size of obstacle/aperture must be comparable with wavelength of light but in daily observations size of obstacle/aperture is much larger than the wavelength of light. Angular width of central fringe βθ = 2λ/a (b) (i) If the width of slit is doubled, the (angular) width of central fringe(∝(1/a)) is halved. (ii) When wavelength of light used is increased (βθ ∝ λ), the width of central fringes increases |
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