01_31_Refraction

# 01_31_Refraction - Today 1/31 o o o o o o No HW due Monday...

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Today 1/31 o No HW due Monday o Diffraction grating 27.7 (quickly) o o Read Ch 26 Sec 1 - 3 o HW: Ch 26 P 13, 16 Due Wed 2-5 o Exam I Thursday, Feb 13

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Diffraction Grating o Sharper (narrower) bright spots than double slit o d sin θ = m λ for constructive interference (same as double slit) Gratings specified with “slits per centimeter” use this to find d.
Refraction-Bending Light o Light slows when entering transparent materials. o Results in a change in direction for light entering at an angle

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Refraction-Bending Light Water - index of refraction, n W = 1.33 Wave crests are closer together in higher index materials because the waves travel slower. Air - index of refraction, n A = 1.0 Think of rows in a marching band that slow down in a mud puddle.
Water - index of refraction, n W = 1.33 When light enters at an angle, it “bends.” Air - index of refraction, n A = 1.0 Think of rows in a marching band that slow down in mud puddle. Ray direction always

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## This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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01_31_Refraction - Today 1/31 o o o o o o No HW due Monday...

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