The diagram shows a ray of light being reflected from a plane mirror.
Four angles are labelled p, q, r and s.
Which angles are the angle of incidence and the angle of reflection?

1 )
angle of incidence: p / angle of reflection: r
2 )
angle of incidence: p / angle of reflection: s
angle of incidence: q / angle of reflection: r
4 )
angle of incidence: q / angle of reflection: s
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