Light travels through the path between two points

1
Light travels through the path between two
points in space that takes the shortest time!!
X
X
2
Starting from A, make one touch at the wall and
finish at B. Which path takes the shortest time?
x A
x B
3
Reflection and Mirrors
qi qr
qi
qr
Law of reflection
4
Who has the better chance to save this drowning
guy?
Pam Anderson
People run faster on sand than swim in water!
5
Refraction Bending of light at the interface
between two different media
air
water
Light travels slower in water than in air.
6
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7
Ex 29-1 A light ray emitted from a point source
is reflected from two flat mirrors as shown in
the figure. What is the angle A?
30