Curved Mirrors

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Curved Mirrors

What are some examples of curved mirrors?

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Concave Spherical Mirrors

A spherical mirror has the shape of part of a sphere’s surface.

Concave Spherical Mirror (Converging Mirror): A spherical mirror with light reflecting from its silvered, concave surface

Concave mirrors are used whenever a magnified image of an object is needed

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Terms you need to know

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Concave Spherical Mirrors (p.531)

A spherical mirror is represented as a shell of a sphere

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Concave Mirror (p.531)

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The Mirror Equation

To use the mirror equation, you must use the correct signs.

Object and image distances are positive if they form on the front side of the mirror

Object and image distances are negative if they form on the back side of the mirror

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Sample Problem (p.536 #2)

A concave shaving mirror has a focal length of 33 cm. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm.

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Solve the problem

p = .93 m

f = .33 m

q=?

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Magnification Equation

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Sample Problem (p.536 #2)

A concave shaving mirror has a focal length of 33 cm. Calculate the magnification of the image. Is the image real or virtual? Is the image inverted or upright?

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Sign Conventions for Magnification

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Find the magnification

The magnification is negative, therefore the image is real and inverted.

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Ray Diagrams

A ray diagram is a drawing that uses geometry to locate an image formed by a mirror.

There are different rules for drawing ray diagrams depending on the type of mirror you have.

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