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Aim: How can we explain Snell’s Law?. Do Now: What is the speed of light in zircon?. Refraction. Waves that are transmitted through a boundary often change direction when entering the new medium. This bending of the path of waves is called REFRACTION. Light Wave. Air. Water.
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Aim: How can we explain Snell’s Law? Do Now: What is the speed of light in zircon?
Refraction • Waves that are transmitted through a boundary often change direction when entering the new medium. This bending of the path of waves is called REFRACTION. Light Wave Air Water Transmitted Ray is Refracted
A beam of light strikes a crown glass block at an angle of 60o. What is the angle of refraction? n1sinθ1 = n2sinθ2 (1.00) sin (60o) = (1.52) sin θ2 sin θ2 = (1.00) sin (60o) (1.52) θ2 = 35o
An incident ray in lucite is refracted through water. If the incident ray is at an angle of 50o, what is the angle of refraction? n1sinθ1 = n2sinθ2 (1.50) sin (50o) = (1.33) sin θ2 sin θ2 = (1.50) sin (50o) (1.33) θ2 = 60o
Less Dense to More Dense • Light is traveling from a FASTER to a SLOWER medium • The light will bend towards the normal. • Ex: Air to water
More Dense to Less Dense • Light is traveling from a SLOWER to a FASTER medium • The light will bend away from the normal line. • Ex: Water to Air
But what if the light is not entering the new medium at an angle? THE LIGHT WILL NOT BEND!! Air Water No Refraction
Relationship between v and λ • FREQUENCY IS CONSTANT v = fλ • v increases λincreases • v decreases λdecreases
As a monochromatic beam of light passes obliquely from flint glass into water, how do the characteristics of the beam of light change? • Its wavelength decreases and its frequency decreases. • Its wavelength decreases and its frequency increases. • Its wavelength increases and it bends toward the normal. • Its wavelength increases and it bends away from the normal.
Trace the path of the ray θ If a ray exits to the same material it started in, the incident angle is equal to the final refracted angle! Flint glass Lucite Diamond θ