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 Spanish - Chinese The Optics Book - G.O. and Thin Lenses Written by:Karen
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Related Articles:

Converging Lens Applet
Diverging Lens Applet
Diverging Mirror Applet
Forum

In this section:

The Optics Book

1. Before Optics
2. Light and Illumination
3. Reflection and refraction
4. Geometrical Optics and thin lenses

Thin Lenses
Ray Diagrams
Equations
Mirrors
Practical Aplications
5. The human eye
6. Optics instruments
7. Scattering & spectrum
8. Color
9. Interferences & difraction
10. Polarization
11. Quantic Optics

# Plane Mirrors

Plane mirrors are the mirrors which we use to view ourselves in.  When we look into a plane mirror, we see our reflection, which isn’t distorted in size.  But the image formed is left right reversed.  That is why if you have a birthmark on your right cheek, it will appear to be on your left cheek in a mirror.  Because the image is erect it must be virtual.

# Mirrors

Curved mirrors work in the same way that lenses work.  The difference is that a concave mirror, works the way a convex lens does, and a convex mirror works the way a concave lens does.  This means that a concave mirror is a converging mirror, so the rays will focus on the same side of the mirror.  On the other hand, a convex mirror will diverge and have a virtual focus located at a point F on the other side of the mirror.  The center of curvature of a mirror is located at 2F.

One of the problems that a spherical mirror has is that Light rays won’t focus directly onto F.  Therefore the image is a little fuzzy.  To correct this, mirrors are shaped parabolically, which forces the Light rays to focus onto F.