CP Physics Glencoe Chapter 18 Mirrors and Lenses

CP Physics Glencoe Chapter 18 Mirrors and Lenses

TEKS Objective: 8 C The student is expected to: Interpret the role of light wave characteristics and behaviors found in medicinal and industrial applications.

Mirrors Three types of mirrors: 1. Plane 2. Concave 3. convex

Vocabulary do = distance the object is from the mirror ho = height of the object di = distance the image is from the mirror hi = height of the image Virtual image – is an optical illusion, cannot be projected onto a white screen. Magnification = 1

Plane or flat mirror The image produced by a flat mirror is behind the mirror It is an optical illusion, it is a virtual image It is upright do = di ho = h i

Flat mirror

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Flat mirror has left and right hand reversal

Lenses: two main types Convex lens = converging lens Concave lens = diverging lens Eyeglasses were 1 st made in the 13 th century Contacts were 1 st made in Houston in 1888

Ray diagrams: 1 st ray goes in parallel to principal axis, refracts at the line of symmetry, goes out through the focal point on the other side of the lens 2 nd ray goes in through the focal point, refracts at the line of symmetry, and goes out parallel to the principal axis

Concave Lens Diverging lens Focal length is negative Image is on same side as object Image is virtual, upright and reduced Corrects nearsightedness

1 st ray goes in parallel to the principal axis, refracts at the line of symmetry, and refracts out as if through the 1 st focal point, must do a trace back 2 nd ray goes from the top of the object straight through the center of the lens without refracting.

The Human Eye

Near sightedness

Far sightedness

Telescope Two converging lenses