In Fig. 6.1, light waves move from air into a glass block.
(a(i))[1]
State the name of the process illustrated in Fig. 6.1 when the wavefronts enter the glass block.
(a(ii))[2]
State two changes that occur in the light waves as they travel from air into glass.
(b)[3]
State and explain how the ray of red light moves through the glass fibre shown in Fig. 6.2.
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