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A person stands 4.2 m in front of a wall that is covered floor-to-ceiling with a plane mirror. His eyes are 1.9 m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the light will reach his eyes?

please tell me where I went wrong.

tan tetha = 1.9m / 4.2m

=0.452380952

inverse tan will give the angle of incidence

= 24.34108994
= 24.3 degrees

According to the system this answer is incorrect. Please tell me where I went wrong.

Two items to check:
1. Recall that the light beam strikes the mirror halfway up the mirror.

2. Check which sides/lengths are used to find tan(theta).

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