In the diagram above, an incident ray AY makes an angle of 30o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20o, while AY is fixed, what angle will the reflected ray now make with the incident ray?

Abdulesun

4 years ago

I will advise My School solves all tricky questions like this to clear ambiguities.
But this is how it is.
If mirror is rotated through 20°, then from the formula, 2theta.
Therefore, 2 x 20= 40°
Then, angle of Incident to the normal is 30° from the diagram. Therefore, since angle i=r, we have 30+30=60°
Therefore, angle of new reflection with incident ray is 40+60= 100°

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Etugo

10 years ago

i need solution?

Nuellapromzy

8 years ago

please workings