A laser beam (l = 694 nm) is incident on two slits 0.100 mm ...

[TVarnum]

A laser beam (l = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
 a. 3.47  10-3
  b. 3.47  10-2
  c. 3.47  10-4
  d. 3.47  10-6
  e. 3.47  10-5

Question 2

A contact lens is made of plastic with an index of refraction of 1.50 . The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?

[Sammyo]

Answer to Question 1

B

Answer to Question 2

+20 cm, +5.0 diopters

[TVarnum]

Gracias!

[shailee]

Excellent