physics :

Question 5 10 pts What is the distance between fringes (in cm) produced by a diffraction grating having 138 lines per centimeter for 621nm light, if the screen is 1.50 m away? Your answer should be a number with two decimal places, do not include unit. S Question 6 10 pts Find the wavelength (in nm) of light that has its third minimum at an angle of 47. 10 when it falls on a single slit of 3 pm. You should round your answer to the nearest integer, do not include unit. 1 nm = 10'9m