An object is located 4 m from the first of two thin converging lenses of focal lengths 2 m and 1 m, respectively. The lenses are separated by 3 m. The final image formed by the second lens is located from the source at a distance of
8.0 m
5.5 m
6.0 m
6.5 m
A ray of light is incident at an angle i on a glass slab of refractive index µ. The angle between reflected and refracted light is 90°. Then, the relationship between i and µ is
tan i = µ
sin i = µ
cos i = µ
When light is refracted from a surface, which of its following physical parameters does not change ?
Velocity
Amplitude
Frequency
Wavelength