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InterviewSolution
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only the central fringe will be white, all other will look colourful. - Using B = 10 43) In Young's experiment, yellow light of wavelength 5890 Å is used. The angular width of the fringes is 0.2^(@). How much do you need to change the wavelength to increase the angular width by 10% ? |
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Answer» Increase of `589Å` Widht of frings `2(d sin theta)=2(1) lambda` `:. 2 theta=(2lambda)/(d)` [ for SMALL angle `sin theta- theta`] In this forumula if d is CONSTANT than `theta prop lambda` `:. (theta_(2))/(theta_(1))=(lambda_(2))/(lambda_(1))` `theta_(2)=theta_(1)+10% theta_(1)` `=1.1 theta_(1)` `:.(theta_(2))/(theta_(1))=(lambda_(2))/(lambda_(1))` `:. (1. theta_(1))/(theta_(1))=(lambda_(2))/(5890Å)` `:. lambda_(2)=6479Å` `:.` Increase in wavelength `=lambda_(2)-labda_(1)` `=6479-5890` `=589Å` |
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