question_answer

In Young's double slit experiment lights of green, yellow and orange colours are successively used. Write the fringe widths for the three colour in increasing order.

Answer:

                Fringe width, \[\beta =\frac{\lambda D}{d}\] i.e., \[\beta \propto \lambda \] As\[{{\lambda }_{G}}<{{\lambda }_{\Upsilon }}<{{\lambda }_{0}}\] , therefore, \[{{\beta }_{G}}<{{\beta }_{\Upsilon }}<{{\beta }_{0}}\] .