A light source simultaneously emits light of two wavelengths, 480 ...

[HCHenry]

A light source simultaneously emits light of two wavelengths, 480 nm and 560 nm, respectively. The source is used in a double-slit interference experiment where the slit spacing is a 0.040 mm, and the distance between double slits and the screen is 1.6 m. What is the separation between the m = 3 bright fringes of the two wavelengths as they appear on the screen? (1 nm = 10-9 m)
 a. 0.96 cm
  c. 0.64 cm
  b. 0.48 cm
  d. 0.16 cm

Question 2

A Young's double-slit apparatus is set up. The source wavelength is 430 nm, and the double-slit spacing is 0.040 mm. At what distance from the double slits should the screen be placed if the spacing between alternating bright fringes is to be 2.6 cm? (1 nm = 10-9 m)
 a. 2.9 m
  c. 2.2 m
  b. 2.4 m
  d. 1.6 m

[phuda]

Answer to Question 1

A

Answer to Question 2

B