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in Physics by (46.5k points)

The diagram in Fig. shows an incident ray AO and the reflected ray OB from a plane mirror. The angle AOB is 30°. Draw normal on the plane mirror at the point O and find :

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Best answer

(i) the angle of incidence 

(ii) the angle of reflection

 

ON is normal on the plane mirror at point O 

ON is perpendicular on a plane mirror 

Angle of incidence ∠i = ∠AON 

and angle of reflection ∠r = ∠BON 

Since, ∠i – ∠r 

∠AOB = 30°

⇒ ∠AON + ∠BON = 30° 

⇒∠i + ∠i – 30° 

⇒ 2 ∠i =30° 

⇒ ∠i = 30 / 2 = 15° 

∴Angle of incidence = ∠i = 15° 

and Angle of reflection ∠i = 15°

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