Refraction of light through a block of glass was reviewed using a print out of a beam of light passing from air through glass and back into air. The review included defining both types of rays, indicating the angles of refraction and the direction of refraction in relation to a normal drawn at the point of entry. Snell's law was given, and how the determination of the angle of refraction can be determined using the law. A concave mirror was set up, a candle image placed at a distance and the image focused on an index card. The definitions of the principal axis, the focal point, the focal length, the radius of the circle formed by the mirror, the center of the mirror, the refraction of parallel rays to the principal axis, the refraction of a ray passing through the center of the circle, the type of image formed, the size formed, and the direction of the image formed were all found from the demonstration.