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In Young's double slit experiment the separation d between the slits is lambda mm, the wavelength of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20^(@). To increase the fringe angular width to 0.21^(@) (with same lambda. and D) the separation between the slits needs to change to ..... |
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Answer» `1.7` mm If `theta` is very SMALL, then `sin theta_(1) theta_(1)` `:. d theta_(1)=lambda` `:. theta_(1)=(lambda)/(d)` `:.theta prop (lambda)/(d) [ :. lambda` and n are same] `:. (theta_(2))/(theta_(1))=(d_(1))/(d_(2))` `:. (0.21)/(0.20)=(2)/(d_(2)) rArr d_(2)` `=(2xx0.21)/(0.20)` `=1.9 mm` |
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