physics 014 images. topics plane mirrors spherical mirrors thin lenses

Physics 014

Images

Topics

Plane mirrors Spherical mirrors Thin lenses

Plane Mirrors

A virtual image CANNOT be seen on a screen

A real image CAN be seen on a screen

Plane Mirrors

Plane Mirrors

Plane Mirrors

O is a point source of light Incident beams from O reflect off

plane mirror Beams reflect at angles consistent

with law of reflection Extend reflections to I, the virtual

point image

Plane Mirrors

Plane Mirrors

For the plane mirror,

i=-p

i is the image distance, p is the object distance

Plane Mirrors

Plane Mirrors

For extended objects Draw ray from base Draw several rays from tip Where ray extension from tip converge is

tip image point

Spherical Mirrors

Two types of spherical mirrors Concave mirror: light rays converge

on real focus Convex mirror: light rays diverge

from virtual focus

Spherical Mirrors

Concave mirrors: Increase image size Move image farther away Reduce field of view

Spherical Mirrors

Convex mirrors: Decrease image size Move image closer Increase field of view

Spherical Mirrors

Spherical Mirrors

We can find an expression relating the distances f, p, and i

fip

111

Spherical Mirrors

How do I find the image using rays?

Spherical Mirrors

Spherical Mirrors

Spherical Mirrors

Extend rays from tip and base of object to determine image location and orientation

Spherical Mirrors

1. Parallel ray reflected through focal point

2. Ray through focal point reflected parallel

3. Ray through center4. Ray reflected symmetrically from c

Thin Lenses

Two types of lenses Converging lenses cause rays to

converge on focal point Diverging lenses cause rays to

diverge from focal point

Thin Lenses

Thin Lenses

Thin Lenses

We may use the same equation we used for mirrors to relate i, p, and f

fip

111

This is not the lens maker’s equation!

Thin Lenses

Thin Lenses

1. Ray initially parallel converge on focal point

2. Ray initially through focal point emerges parallel

3. Ray through center emerges unchanged

Thin Lenses

Thin Lenses