Light from a helium-neon laser (λ = 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 2.8 m behind the slits. Twelve bright fringes are seen, spanning a distance of 50 mm. Part A What is the spacing (in mm) between the slits? Express your answer in millimeters. d= Submit OF 197| ΑΣΦ/ Request Answer ? mm

Excited potassium atoms emit deep-violet light at wavelengths 404.4 nm and 404.7 nm. Suppose light from a potassium lamp passes through a diffraction grating that has 960 slits per millimeter. Part A How far behind the grating must a viewing screen be placed so that the two first-order tringes are separated by 10 Express your answer with the appropriate units. L= 0.00238 m Submit Previous Anawace Bequest Answer X Incorrect; Try Again; 13 attempts remaining.

An oil film (n = 1.46) floats on a water puddle. You notice that green light (X= 528 nm) is absent in the reflection. Part A What is the minimum thickness of the oil film? Express your answer to three significant figures. V ΑΣΦ Sw ? nm

Light of wavelength 690 nm falls on two slits and produces an interference pattern in which the fourth-order fringe is 37 mm from the central fringe on a screen 2.5 m away. Part A What is the separation of the two slits? Express your answer using two significant figures. ΑΣΦ d=270 10 6 = ? Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining m