Class Notes (806,972)
United States (312,289)
Physics (56)
PH 122 (46)

Critical angles, rainbows, thin film interference

3 Pages
Unlock Document

Colorado State University
PH 122
Brian Jones

25 April Light of wavelength 500 nm in air enters a glass block with index of refraction n=1.5. When the light enters the block, which property of light does not change? Frequency If energy is conserved, the frequency must remain the same What Determines Color? The wavelength of a light wave is 700 nm in air; this light appears red. If this wave enters a pool of water, its wavelength becomes: λ = λair.33 = 530 nm If you are swimming underwater, this light still appears red. Given this, what property of a light wave determines its color? Frequency Critical Angles n2 θ = sin (1 ) c n1 What are the critical angles for Water (n=1.33) – 48° Diamond (n=2.42) – 24° Mirages are caused by total internal reflection. Making a Rainbow The sun is behind your back when you see a rainbow. Dispersion causes different colors to refract inside water droplets at different angles. Most of the light refracts into the air at the back of the droplet, but a little reflects back into the drop. Dispersion separates the colors even more as the rays refract back into the air. Seeing a Rainbow You see a rainbow with red on the top, violet on the bottom. Red light is refracted predominantly at 42.5°. The red light reaching your eye
More Less

Related notes for PH 122

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.