Textbook Reference 10.4 (P )

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 handout

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. handout

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. handout

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. handout

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. handout

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. handout

Steps to Locating Images in Convex Mirrors... STEP 3 Draw the image where the two rays converge to the parallel axis. handout

Steps to Locating Images in Convex Mirrors... CHECK 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. handout Point of intersection for all 3 rays C

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”