Download presentation

Presentation is loading. Please wait.

Published byRoberto Durrell Modified over 2 years ago

1
Lecture 28, Wednesday April 15 Diffraction Grating Thin Film Interference Single Slit Diffraction

2
Problems due Today 17: 13, 17, 19, WB 25: 1-18 13: diffraction grating 17: ditto 19: skip b WB 17: 1-9 pictures of interference 25: 19, 22, 28, 29, 31

3
Two slit interference Young demonstrated light behaved as a wave. Bright fringes occurred at angles For small angles

4
QUIZ # 9 Two narrow slits 0.04 mm apart are illuminated by light from a HeNe laser (λ = 633 nm). A. What is the angle of the first (m = 1) bright fringe? B. What is the angle of the thirtieth bright fringe? Slide 17-11

5
Index of Refraction—cf. Lab last week Index of refraction

6
The Diffraction Grating Slide 17-12

7
The Intensity Pattern Due to a Diffraction Grating Slide 17-14

8
The Fringes Become Very Narrow as the Number of Slits is Increased Slide 17-15

9
A Diffraction Grating Splits Light into the Wavelengths That Make It Up Slide 17-16

10
All waves spread out after passing through a small enough gap in a barrier. This phenomenon is known as 1.Antireflection 2.double-slit interference 3.Refraction 4.diffraction

11
Problems due Friday 17: 1, 2, 4, 7, 9, 10, 12 2: speed in glass 4: wavelength in glass 7: two slit interference 9: ditto, given d and y 5 – y 1, find λ 10: two slits given fringe spacing, λ 12: Δr

12
Problems 25: 19 E = 10 V/m in an electromagnetic wave. What is B? 22: – What is λ, f, and electric field amplitude? 28: I = 10 W/m 2 for a linearly polarized wave. Intensity through polarizer with b) θ = 30 0 ?

13
More Problems 29: 25% passes polarizer. Angle of polarizer with respect to electric field? 31: Unpolarized light with I = 350 W/m 2 – What is I after two polarizers with second axis 35 0 to axis of first?

14
Problems 17 CQ1: frequency in water, glass CQ3: change in λ n, does it change apparent color? MC17: what changes when light enters glass? 1: travel time through piece of glass

15
Thin-Film Interference Slide 17-17

16
Phase Changes Due to Reflection Slide 17-18

17
Analyzing Thin-Film Interference Slide 17-19

18
Single-Slit Diffraction Light passing through a narrow slit spreads out beyond the slit. Slide 17-23

19
Analyzing Single-Slit Diffraction Slide 17-24

20
Single-Slit Diffraction: Positions and Intensities Slide 17-25

Similar presentations

OK

Young’s Experiment ․Young’s Double-Slit interference Exp.

Young’s Experiment ․Young’s Double-Slit interference Exp.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on tamper resistant screws Ppt on bill gates Ppt on stock market in india Ppt on reflection of sound Cool backgrounds for ppt on social media List ppt on equity market Ppt on natural numbers their opposites Ppt on any social issues in india Ppt on hydroelectric power plant Ppt on internal trade for class 11th