plz answer 7th and 8th question
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7. 90-30=60°
8. the angle of incidence and the angle of reflection is same that is 20°
8. the angle of incidence and the angle of reflection is same that is 20°
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7.60
8.Li=Lr(according to law of reflection)
if Li is 20. Lr will be 20
8.Li=Lr(according to law of reflection)
if Li is 20. Lr will be 20
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