Reflection of light

  • #1

Homework Statement



A person stands 3.6m in front of a wall that is covered floor to ceiling with a plane mirror. His eyes are 1.8m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angel of incidence must the light strike the mirror so the light will reach his eyes?


Homework Equations


angle of incidence=angle of reflection


The Attempt at a Solution



I don't know what equation to use to get the answer
 

Answers and Replies

  • #2
8
0
Try drawing a picture of the problem. Diagrams are your best friend in optics problems.
 
  • #3
hage567
Homework Helper
1,509
2
Try drawing a picture of the problem. Diagrams are your best friend in optics problems.
Excellent advice, link2001!

Think trigonometry.
 
  • #4
yep, use trigonomety, draw a triangle, put x as the angle to the normal, the normal length is infinate but draw it as 3.6, and the height from the feet of the person , so that makes theta= inverse of tan( 0.9 divided by 3.6), that should give the angle to the normal. :D
 

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