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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
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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
Movie Projector
Photocopy Machine
Magnifying Glass
5. The human eye
6. Optics instruments
7. Scattering & spectrum
8. Color
9. Interferences & difraction
10. Polarization
11. Quantic Optics

Lenses Aplications: Movie Projector - Photocopy Machine - Magnifying Glass

Magnifying Glass

In those old detective movies, before all those high tech instruments had been developed, the detective always has a magnifying glass to inspect the crime scene.  Perhaps you have wondered how a magnifying glass actually works.  It just seems like a piece of glass attached to a handle, but then windows are glass, and when we look through them the outside does not seem to be magnified.  This is because the glass in a magnifying glass is acting as a lens.  It is actually curved sLightly to form a convex lens, while the glass in our windows are plane glass.

The magnifying glass is not projecting an image onto anything; it is merely bending the Light rays from the object so that the object will appear larger.  The magnifying glass is an example of a Case 6 situation, of which the object is between the center of the lens and F, and the image is magnified, virtual and upright, and on the same side.  This is why a magnifying glass only works when it is close enough to the object (because the object must be between the center and F).

 Magnifying Glass Credits: Karen Wu