Bouncing Beams and Sticky Glass EM Wave Phenomenon

Reflection Waves that change mediums or hit boundaries obey the Law of Reflection. Angles are always measured from the normal! Equation θiθi θrθr incident ray reflected ray normal

Refraction Fast  Slow = away from normal Slow  Fast = toward normal Equation Snell’s Law θrθr incident ray reflected ray normal θ2θ2 refracted ray n1n1 n2n2 θ i or θ 1

Refraction Wavelengths change with corresponding differences in speed. Equation

Refraction (Special Cases) -Special cases in which no bending occurs… -Two mediums with the same index of refraction. -A ray entering another medium at an angle of 0° corn oil glycerol air diamond n 1 sinθ 1 = n 2 sinθ sinθ 1 = 1.47 sinθ 2 θ 1 = θ 2 n 1 sinθ 1 = n 2 sinθ sin 0° = 2.42 sinθ 2 0 = 2.42 sinθ 2 θ 2 = 0°

A ray of light with a frequency of 5.09 x hertz moves from air into flint glass. The angle with which the ray strikes the surface of the flint glass is 40° away from the normal. Which is the faster medium? Determine the angle of refraction. Draw the refracted ray. air flint glass n 1 sinθ 1 = n 2 sinθ sin 40° = 1.66 sinθ 2 θ 2 = 23° air is faster (lower index) Example

The Wave Nature of Light Consider each of the 8 phenomenon. Which of them could be demonstrated with light? Which are PROOF that light has a wave nature? Which can also occur with particles?

Reflection Works with BOTH particles and waves. NOT proof that light is a wave.

Interference ONLY occurs with waves. Supports wave model of light.

Standing Waves Waves ONLY. Lasers – supports wave model.

Resonance Waves ONLY. Lasers – supports wave model

Doppler Effect Waves ONLY. Red shift/Blue shift – supports wave model.

Diffraction Waves ONLY. Supports wave model.

Refraction Does not DIRECTLY support wave model.

Polarization Waves ONLY. Supports wave model.

Double Slit Experiment Thomas Young’s double slit experiment is the best demonstration of light’s wave nature as it combines both diffraction and interference.

End of PRACTICE