00 ´ 108 m s–1
(b)
Refracted light: (frequency same as the incident frequency)
n = 5 09 ´ 1014Hz
v = (c/n) = 2 26 × 108 m s–1, l = (v/n) = 444 nm
10 2
(a)
Spherical
(b)
Plane
(c)
Plane (a small area on the surface of a large sphere is nearly
planar)