Unit 3 Optics: Chapter 5

Law of Reflection

To show how light is _______________________________ from a solid surface, we can use ray diagrams. A ray diagram has 5 main components:

1. __________________________________________________________: __________________________________________________________________________________________________________________________________________________________________________________________

2. __________________________________________________________: __________________________________________________________________________________________________________________________________________________________________________________________

3. __________________________________________________________: __________________________________________________________________________________________________________________________________________________________________________________________

4. __________________________________________________________: __________________________________________________________________________________________________________________________________________________________________________________

5. __________________________________________________________: __________________________________________________________________________________________________________________________________________________________________________________________

YOU HAVE TO DRAW THIS!

*__________________________________________________________: _____________________________________________________________________________________________________

Recall:_______________________________________________________ (reflection from a mirror-like surface)

________________________________________________________________________________ For a surface to act as a mirror and produce _____________________________

reflection, it must be _______________________ compared to the wavelength of the light striking the surface.

YOU HAVE TO DRAW THIS!

_____________________________________________________________ (reflection from a rough surface). No clear image produced, but you can see the surface the light is bouncing

off. Light bounces off in random directions Example: A piece of paper (the black ink absorbs all the light and the white

paper reflects all the light in random directions )YOU HAVE TO DRAW THIS!

How Do We Use Specular and Diffuse Reflection Everyday? ________________________________________________________________________________________

_ ________________________________________________________________________________________

_ ________________________________________________________________________________________

_ ________________________________________________________________________________________

_ ________________________________________________________________________________________

_ ________________________________________________________________________________________

_ ________________________________________________________________________________________

_

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Types of Mirrors1. ______________________________________________________:

__________________________________________________________________________________________________________________________________________________________________________________

2. ______________________________________________________:_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

3. ______________________________________________________:___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Examples:Plane: ________________________________________________________________________________Concave: _____________________________________________________________________________Convex: ______________________________________________________________________________

Images in a Plane Mirror

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The angle of incidence and the angle of reflection are always ___________________________ (law of reflection).

The image and the object distance from the mirror are always _________________________.

Ray diagram of a Plane Mirror (Page 189)

***Core Lab Page 192***

Images in Concave Mirrors

Reflected light rays travel __________________________________________________________________. _______________________________:

________________________________________________________________________________ _______________________________:

________________________________________________________________________________

If you then draw rays of light approaching the mirror parallel to the principal axis, you will see that all of the reflected rays intersect at one point. This is the ____________________________________________________________________________________.

Ray diagrams for Concave Mirrors Object is between Focal point and Mirror (See Page 198)

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YOU TRY IT!!!

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The image will be …1. Size2. Position3. Orientation (upright/inverted)4. Type of image (Real/virtual)

Object is between the focal point and 2X the focal length. (See Page 200)

The image will be …1. Size2. Position3. Orientation (upright/inverted)4. Type of image (Real/virtual)

YOU TRY IT!

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Object is beyond 2X the focal length. (See Page 202)

YOU TRY IT!

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The image will be …1. Size2. Position3. Orientation (upright/inverted)4. Type of image (Real/virtual)

Textbook: page 202 #'s 1-2

Images in Convex MirrorsReflected rays __________________________________________________. But, if you extend the rays _______________________________ the mirror, the extended rays will intersect at the ________________________________________________________, F.

The focal point for a convex mirror is _____________________________________________.

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Ray diagrams for Convex MirrorsWhen drawing ray diagrams for a convex mirror, you follow the same steps no matter where the object is in relation to the mirror (the object distance doesn’t matter).

Remember in convex mirrors the focal point is always BEHIND THE MIRROR.

See Page 205

The image will be …1. Size2. Position3. Orientation (upright/inverted)4. Type of image (Real/virtual)

YOU TRY IT!

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***Textbook: page 206 #'s 1-3***

Summary:

There are two types of curved mirrors: 1) ______________________________________________ have a reflective surface that curves

inward. Depending on the location of the object relative to the focal point of the mirror, images in these mirrors can be:

1) ______________________ or ____________________________ ( a real image is formed when reflected rays meet).

2) ______________________ or _____________________________3) ____________________________ or _______________________ than the object

2. ______________________________________________ have a reflective surface that curves outward. Images in convex mirrors are:

1. ________________________________________________________________________________2. ________________________________________________________________________________3. ________________________________________________________________________________4. ________________________________________________________________________________

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WHAT WILL IT LOOK LIKE! (SPOT)

Mirror/Object type

Size Position Orientation Type

Concave mirror(Object between focal point and mirror)

Concave Mirror (Object between focal point and two times the focal length)

Concave mirror (Object beyond two times the focal length)

Convex mirror

Real Vs. Virtual Images Describe the difference between real and virtual images. Use your notes and

your textbook:______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________P. 187, #s 2, 7a, 9a&b, and 10; P. 209, #s 1-12

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