Biomedical Engineering Reference
In-Depth Information
KEY FORMULA
Snell's law:
n
(sin
θ
)
=
n
′
(sin
θ
′
)
SELF-ASSESSMENT PROBLEMS
1. A ray of light emerges from a pond of water at an angle of 45 degrees to the
normal. What angle did the incident ray make with the normal?
2. A ray of light is incident upon a pond of water that is 2.0 m deep. If the angle of
incidence is 25 degrees, by how many centimeters is the ray deviated as it travels
through the pond?
3. A crown glass slab, 75.00 cm thick, is surrounded by air. A ray of light makes an
angle of 30 degrees to the normal at the front surface of the slab. At what angle
(to the normal) does the ray emerge from the slab?
4. What is the smallest angle of incidence that will result in total internal reflec-
tion for a light ray traveling from a high-index glass (index of 1.72) to air?
5. What is the critical angle for a diamond surrounded by water?
