In a double-slit experiment using monochromatic light, a screen is placed 1.25 m away from the slits,

Question:

In a double-slit experiment using monochromatic light, a screen is placed 1.25 m away from the slits, which have a separation distance of 0.0250 mm. The position of the third-order maximum is 6.60 cm from the center of the central maximum. Find
(a) The wavelength of the light and
(b) The position of the second-order maximum.