The diagram shows a beam of light travelling through glass and meeting a glass-air interface.
Which row correctly describes what is happening at the glass-air interface?
angle of incidence at the interface:30° / observation:some internal reflection
2 )
angle of incidence at the interface:30° / observation:total internal reflection
3 )
angle of incidence at the interface:60° / observation:some internal reflection
4 )
angle of incidence at the interface:60° / observation:total internal reflection
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