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United States (324,414)
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PH 122 (46)
Lecture

# Index of refraction, total internal reflection

2 Pages
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Department
Physics
Course
PH 122
Professor
Brian Jones
Semester
Spring

Description
23 April Warming Up Light passes through a 10-μm-wide slit and is viewed on a screen 1 m behind the slit. If the width of the slit is narrowed, the band of light on the screen will… Become wider Blue light of wavelength 450 nm passes through a diffraction grating with a slit spacing of 0.001 mm and makes a diffraction pattern on the wall. How many bright fringes will be seen? dsinθ m mλ sinθ m 1 .001x10 m−3 −9 = m = 2.2 450x10 m 5 bright fringes The Index of Refraction n = speed of light in a vacuum/speed of light in the material = c/v v = c/n Denser material – slower speed Changing Speed Makes Light Bend n1sinθ1= n 2inθ 2 If speed changes, angle changes Sample Pro
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