An optical fiber made of glass with an index of refraction 1.50 that is coated with a material with index of refraction 1.30 has a critical angle of
A) 90.
B) 41.8.
C) 60.0.
D) 50.2.
E) This combination will not work.
Question 2
Consider 550. nm light passing through 2 narrow slits 2.10 micro-meters apart. The 1st and 2nd order fringes are 1.00 mm apart on a distant screen. How far apart are the 2nd and 3rd order fringes?
A) 1.35 mm
B) 1.00 mm
C) 0.750 mm
D) 0.500 mm
E) 1.74 mm
