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Answer the following questions : (a) In a double-slit experiment using light of wavelength 600 nm, the angular width of the fringe formed on a distant screen is 0.1. Find the spacing between the two slits. (b) Light of wavelength 5000 Å propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the refleceted and refracted light be affected? |
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Answer» Solution :`lambda = 600 nm = 600 xx 10^(-9) m` `theta = 0.1^@ = (0.1 xx 3.14)/(180)` `theta = lambda/a implies a = lambda/theta = (600 xx 10^(-9) xx 180)/(0.1 xx 3.14)` `= 3.4 xx 10^(-4) m`. (B) No change in wavelength and frequency of reflected LIGHT. But for refracted light, frequency remais same but wavelength will become `1/(1.33)` TIMES the original wavelength. |
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