12 Physics Wave Optics - Set No : 42 Question No :10
Question No : 10
In a
two-slit experiment, with monochromatic light, fringes are obtained on a
screen placed at some distance from the slits. If the screen is moved by  towards slits, the change in fringe width is  Then the wavelength of light used is (given that
distance between the slits is  ) |
| a) |  | b) |  |
| c) |  | d) |  |
Answer No : 10
(d)Fringe width  Where  is the distance between slit and
screen,  is the distance between two slits,  is the wavelength of light   |