Textbook Reference 10.4 (P.431-434)

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Textbook Reference 10.4 (P.431-434). Convex (diverging) Mirrors. Convex Mirrors. A mirror with a surface curved outward is a convex mirror , also called a diverging mirror A convex mirror spreads out the rays. . Uses for Convex Mirrors.

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Textbook Reference 10.4 (P.431-434)

Convex (diverging) Mirrors

Convex Mirrors

A mirror with a surface curved outward is a convex mirror, also called a diverging mirror

A convex mirror spreads out the rays.

Uses for Convex Mirrors

Because convex mirrors allow you to see more than plane mirrors, they are often used for security in stores as well as rear-view mirrors in cars.

Images Formed by Convex Mirrors

All images in a convex mirror are virtual.

The reflected light rays never meet and the image appears to come from behind the mirror.

Images in Convex Mirrors
• Rules are similar to those for concave mirror except:
• Focus is now called VIRTUAL FOCUS
• Both F and C are behind the mirror
• Light rays reflecting off a convex mirror diverge (this is why a convex mirror is called a diverging mirror)
• Light rays seem to come from an apparent light source behind the mirror
• Creates virtual images

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Light Rays in a Convex Mirrors

RULE: If the incident ray is parallel to the principal axis, it will reflect as though coming from F.

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Light Rays in a Convex Mirrors

RULE: If the incident ray is directed at the focus, it will reflect as parallel to the principal axis.

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Light Rays in a Convex Mirrors

RULE: If the incident ray is directed at the centre of curvature, it will reflect straight back on itself.

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Steps to Locating Images in Convex Mirrors ... STEP 1

Draw ray 1 from the top of the object.

The incident ray parallel to the principal axis reflects out, as if it came from the focus.

Extend the reflected ray behind the mirror.

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Steps to Locating Images in Convex Mirrors ... STEP 2

Draw ray 2 from the top of the object.

The incident ray is aimed at the focus, and reflects parallel to the principal axis.

Extend the reflected ray behind the mirror.

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Steps to Locating Images in Convex Mirrors ... STEP 3

Draw the image where the two rays converge to the parallel axis.

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Steps to Locating Images in Convex Mirrors ... CHECK

Point of intersection for all 3 rays

C

Draw the third ray to check the image.

Incident and reflected rays go through the centre of curvature. If it intersects, your drawing is correct.

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Properties of Images in Convex Mirrors
• Image will always be:
• Size = SMALLER
• Attitude = UPRIGHT
• Location = BEHIND THE MIRROR
• Type = VIRTUAL
• Convex mirrors are useful as security mirrors in stores and side-view mirrors on vehicles.
Some Uses for Convex & Concave Mirrors
• CONVEX mirrors are useful as security mirrors in stores & side-view mirrors on vehicles.
• CONCAVE mirrors are useful as flashlights, telescopes, car headlights, dental examination lights, and other applications.
HOMEWORK
• TEXTBOOK
• P.434 Learning Check #1,3,4
• WORKSHEET
• “Curved Mirror”