As you come in Get one of each mirror type

Complete the following What is different about the mirrors? What do you notice about the images

each form?

SPH 3U

September 24, 2008

Spherical mirrors have the shape of a segment of a sphere

Two types of spherical mirrors Concave mirrors Convex mirrors

Silvered inner surface for reflecting light

Positive radius of curvaturePositive focal length

Silvered outer surface for reflecting light

Negative radius of curvatureNegative focal length

Principal Axis – the line that passes through the exact center of the mirror

Centre of Curvature - The point in the center of the sphere from which the mirror was sliced (C)

Radius of Curvature - The distance from the vertex to the center of curvature (R)

Focal Point – A point midway between the vertex and the center of curvature (F)

Focal Length - The distance from the mirror to the focal point (f)

Ray 1 is drawn parallel to the principal axis and is reflected back through the focal point F.

Ray 2 is drawn through the focal point and is reflected back parallel to the principal axis.

Ray 3 is drawn through the center of curvature, C, and is reflective back on itself

Concave Any incident ray traveling parallel to the

principal axis on the way to a concave mirror will pass through the focal point upon reflection.

Any incident ray passing through the focal point on the way to a concave mirror will travel parallel to the principal axis upon reflection.

Convex Any incident ray traveling parallel to the

principal axis on the way to a convex mirror will reflect in such a manner that its extension will pass through the focal point.

Any incident ray traveling towards a convex mirror such that its extension passes through the focal point will reflect and travel parallel to the principal axis.

Concave

Convex

do = object distance f = focal length hi = image height di = image distance C = radius of curvature ho = object height

m = magnification

Quantity In Front In Back Upright Image Inverted Image

Object location + -

Image location + -

Focal Length + -

Image Height + -

Magnification + -

A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a concave mirror having a focal length of 15.2 cm. Determine the image distance, the image size and magnification.

Use a ray diagram and then use the mirror formulas to check your work

A 4.0-cm tall light bulb is placed a distance of 35.5 cm from a convex mirror having a focal length of -12.2 cm. Determine the image distance, the image size and image magnification.

Use a ray diagram and then use the mirror formulas to check your work

http://webphysics.davidson.edu/physlet_resources/dav_optics/Examples/optics_bench.html

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