A. Light from an argon laser strikes a diffraction grating that has 4,343 lines per cm. The first-order principal maxima are separated by 0.5 m on a wall 1.57 m from the grating. What is the wavelength of the laser light in nm? Enter an integer.

B.A screen is placed 32 cm from a single slit which is illuminated with 549 nm light. If the distance from the central maximum to the first minimum of the diffraction pattern is 2.5 mm, how wide is the slit in micrometer?

Enter an integer.