Light Reflection

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Light Reflection


Lecture number:
22
Pages:
4
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Unformatted text preview:

Lecture 22 Outline of Last Lecture I. Light a. particle-wave duality b. from a point source: i. far from point, waves become essentially planar: ii. If λ << d, waves pass straight through a small opening. iii. If λ ≈ d, waves spread out past opening. iv. If λ >> d, waves spread out a lot past opening (diffraction). II. Reflection a. specular reflection i. reflection off of a smooth surface ii. parallel incident light rays will be parallel after reflection b. diffuse reflection i. reflection off of a rough surface ii. parallel incident light rays will not be parallel after reflection c. Law of Reflection: When light is reflected off a surface, the incident angle (θi) is equal to the reflected angle (θr). i. Incident ray, reflected ray, and normal line will all be in the same plane. ii. The path of the light is reversible. III. Image Formation a. virtual image: light rays only appear to emanate from the image location, the rays do not actually diverge from this location b. real image: light rays diverge from the image location; this kind of image can be displayed on a screen Physics 012 1st Edition



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