1. A ray of light
in glass makes an angle of incidence of 50° with a glass-water boundary. What angle of
refraction does the light make in the water?
59.8°
85.4°
42.8°
30.5°
2. What is the critical angle for this glass-water boundary?
42.8°
90°
62.5°
55.8°
3. A boundary separates two media of absolute refractive indices n1 and n2,
where n1 > n2.
State the two conditions required for total internal reflection to take place.
Incident light must be in material of refractive index n1
Incident light must be in material of refractive index n2
Incident light must strike the boundary at an angle greater than the
critical angle c
Incident light must strike the boundary at an angle less than the
critical angle c
4. Find an expression for the critical angle in terms of n1
and n2.
