Consider a case of thin film interference as shown. Thickness of film is equal to wavelength of light in µ2.
(a) Reflected light will be maximum if µ1 < µ2 < µ3
(b) Reflected light will be maximum if µ1 < µ2 > µ3
(c) Transmitted light will be maxima if µ1 < µ2 < µ3
(d) Transmitted light will be maxima if µ1 < µ2 > µ3