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Section 4.4 (p. 318-321)

Drawing

Ray Diagrams

for

Convex Mirrors

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Convex Mirrors

A convex mirror is a mirror with a surface curved outward.

Instead of collecting light rays, convex mirrors spread out the rays.

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Drawing a Convex Mirror Ray Diagram

Use an upright arrow to represent the object.

Show real light rays as solid lines.

Use dashed lines to illustrate virtual light rays.

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Remember to always use a ruler when drawing light rays.

It is also helpful to have coloured pencil crayons to represent different light rays.

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Step 1:

The first ray travels from a point on the object parallel to the principal axis.

Any ray that is parallel to the principal axis appear to have originated from the focal point.

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Step 2:

The second ray travels from a point on the object toward the focal point.

Any ray that is directed at the focal point will be reflected back parallel to the principal axis.

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Step 3:

Draw the virtual image where the rays appear to intersect.

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Uses for Convex Mirrors

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Store Security

      • Allows employees to view a large region of the store from one location.

Automobile Side-View Mirror

      • Allows the driver to view a large area surrounding the vehicle.

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Seatwork / Homework

Read Section 4.4 (p. 318-321)

Answer:

      • p. 319 #1-3
      • p. 321 #1-3