23.8 & 9 spherical mirrors & thin lenses
Two kinds of mirrors and lenses that affect light in different ways
Converging: the mirror or lens may but not always cause the light
rays to converge (come together) at a point
Spring break next week no classes or homework due
Homework 9 due Tuesday, March 24 at noon
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Fall peer mento
1. A ray of light travels through a medium with index of refraction 1 . The ray strikes the boundary of another
medium (with index of refraction 2 ) at an angle of 25 away from the normal (or perpendicular) direction.
a. If 1 < 2 , is the transmitt
Lecture 11 - problem 1
Tuesday, February 24, 2015
Example 22.4 - Given the components of the electric field vector of an electromagnetic wave:
In what direction is the wave traveling? What is ?
WSU 2140 W15 Page 1
Homework 6 #2
Tuesday, February 2
23.3 refraction of light & Snells law
When light crosses from one material to
another, the speed and wavelength of the light
change but the frequency remains the same
This results in a change of the direction the
1. A ray of light travels through a medium with index of refraction . The ray strikes the boundary of another
medium (with index of refraction ) at an angle of 25 away from the normal (or perpendicular) direction.
a. If < , is the transmitted light
1. The magnetic field of an electromagnetic wave is given by
(, ) = (1.2 106 ) sin [2 (
240 8 107
a. What is the amplitude of the B-field of the wave?
b. What are the wavelength (in ) and frequency (in ) of the wave?
c. What is the direction o
1. The light from the sun, when it reaches the Earth in July, has an intensity of 1322 /2 . At this time, the Earth
is 152 106 from the sun.
a. What are the maximum magnetic and electric fields of the suns light as it reaches the Earth in July?