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(a) State two conditions necessary for total internal reflection to occur.
(b) Figure 9 shows a ray of light incident on the boundary between two media 1 and 2 at an angle .
Show that the refractive index for a ray of light travelling from medium 1 to medium 2 is given by: 1n2=1sinθ
(c) Figure 10 shows a ray of light incident on one face of a block of ice of refractive index 1.31 and totally reflected at the adjacent face.
(i) Angle ϕ
(ii) Angle x
(iii) Angle θ , the greatest angle for which the total internal reflection is possible.