Two slits are illuminated by a 390 nm light.The angle between the zeroth-order bright band at the center of the screen and the fourth-order bright band is 19.6 degress.If the screen is 171 cm from the double-slit,
(a) how far apart is this bright band from the central peak? Answer in cm.
(b) What is the distance between the two slits?Answer in mm.