Science Projects And Inventions

YOU  NEED:

• A coffee mug
• A paper with printing on it.
• Mylar mirror
• Glue

Another way to make a mirror which does not reverse is to place two ordinary mirrors at right angles to each

doesn't know who the first person was to think of the following delightful way to demonstrate the  properties

of such a curved mirror.

Take a coffee mug with cylindrical sides as in the illustration. On one side of the, mug, on its inside base, glue a

piece of paper with printed words on it.

At the top of the mug, directly opposite, glue a rectangle cut from the Mylar mirror paper.

When you look at the reflection of the printing in the Mylar,  you will find that the printed words read normally.

HOW DOES IT WORK?

In an ordinary mirror, light is reflected straight back at you from the same side of the mirror, causing the image to appear reversed.

In a mirror that does not reverse, light rays are reflected into the opposite side of the mirror before they reach you.

So the image is reversed, then reversed again and things appear as you would expect them to be. To follow the paths of reflected light rays, remember that the angle of incidence (the angle between the incoming light ray and the mirror’s surface) equals the angle of reflection.

FOOD FOR THOUGHT

The pupil in our eye changes in size. Why? There is a circle of muscles which makes up the pupil of the eye. In dim light the pupil becomes larger in order to admit more light while in bright light the pupil becomes smaller. You can see this my using a mirror. Look in the mirror in dim light and see your pupils: then switch on the light and observe your pupils again.