In a Young's double slit experiment using yellow light of wavelength 550nm, the fringe separation is 0.275 nm
(a) Find the slit separation if the screen on which the fringes appear is 2.0 m from the slit.
(b)The yellow light is replaced with a purple one whose light is made of two colors, red light and violet light. If distance between the violet fringes is 0.20mm, what is the wavelength of violet light?