Physic please check
posted by Mary .
A person stands 4.2 m in front of a wall that is covered floortoceiling 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).
Respond to this Question
Similar Questions

physics
A person stands 4.4 m in front of a wall that is covered floortoceiling 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 … 
physics  PLEASE HELP
A person whose eyes are H = 1.62 m above the floor stands L =2.24m in front of a vertical plane mirror whose bottom edge is 43 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the … 
maths
Let the bottom edge of a rectangular mirror on a vertical wall be parallel to and h feet above the level floor. If a person with eyes t feet above the floor is standing direct at a distance d feet from the mirror, what is the relationship … 
Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The … 
Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The … 
Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The … 
physics
A person whose eyes are 2.87 m above the floor stands 2.11 m in front of a vertical plane mirror whose bottom edge is 41 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest … 
calculus
A painting is hung on a wall in such a way that its upper and lower edges are 10 ft and 7ft above the floor, respectively. An observer whose eyes are 5 ft above the floor stands x feet from the wall. How far away should the observer … 
math
A painting is hung on a wall in such a way that its upper and lower edges are 10 ft and 7ft above the floor, respectively. An observer whose eyes are 5 ft above the floor stands x feet from the wall. How far away should the observer … 
Physics
A person whose eyes are 1.50 m above the floor stands in front of a plane mirror. The top of his head is .10 m above his eyes. How far above the floor should the bottom edge of the shortest possible mirror be placed?