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Lecture 33 Review for Exam 4 Interference, Diffraction Reflection, Refraction.

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Presentation on theme: "Lecture 33 Review for Exam 4 Interference, Diffraction Reflection, Refraction."— Presentation transcript:

1 Lecture 33 Review for Exam 4 Interference, Diffraction Reflection, Refraction

2 An interference pattern from 2 slits is observed on a screen. If d is doubled 1.The interference pattern does not change 2.The fringe spacing doubles 3.The fringe spacing is halved 4.Need to know wavelength

3 Diffraction grating problem In order to determine the spacing d, of a diffraction grating (often called the grating constant), I shown a HeNe laser (λ=633nm) through the grating. On a screen 50cm away, I measured the distance between the central, m=0 bright fringe and the m=1 bright fringe and found the distance to be 9.65 cm. What is the d?

4 What is n for this material? Light incident from air, λ = 540 nm What is the critical angle for total internal reflection? 40 0 30 0

5 The interference pattern from 2 slits is observed. As λ is increased 1.The fringe spacing increases 2.The fringe spacing decreases 3.Does not change 4.Need to know λ 5.Need more information

6 Question What is the difference between diffuse and specular reflection? What is θ OUT ? 35 0 θ OUT AIR n=1.63 AIR

7 Using a 600 lines per mm grating At what angle will I find the m = 2 line for a wavelength λ = 530 nm?


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