1. Mirrors and Lenses

2. Why is
the word
AMBULANCE
spelled
backwards?

3. Mirrors and lenses change the path of light waves and affect the images that you see.

4. Rays and the Paths of Light Waves
Electromagnetic waves (light) travel in a straight line in all directions away from its source.
Because light travels in a straight line you can use a ray to show its path.

5. Rays are especially useful to show the path of light after reflection, refraction, or diffraction.

6. Mirrors and Reflection of Light
The shape of
a mirror
affects the
way light
reflects from it.

7. Mirrors are classified by their shape.
1. Plane-has a flat surface, image is right side up and about the same size, image is reversed from left to right.

8. 2. Concave-curves inward - image may be right side up or upside down depending on the object’s distance from the mirror.

11. 3. Convex-curves outward, image is right side up and smaller than the original object

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16. Lenses and Refraction of Light
What do cameras, movie projectors and
telescopes all have in common?
They all use lenses to create images

17. A lens is a transparent object that forms an
image by refraction, or the bending of light.
Lenses are classified by their shape.

19. Convex Lens thicker in the middle than along the edges
used in magnifying glasses and cameras
sometimes used in eyeglasses
The distance between an object and a convex lens determines the size and kind of image formed.

20. When light passes through a convex lens,
the rays are refracted toward each other

21. thinner in the middle than along the edges
Concave Lens
thinner in the middle than along the edges
used in microscopes and eye glasses
sometimes combined with other lenses in telescopes
(the combination of lenses produce clearer images of distant objects)

22. When light rays pass through a concave lens,
the rays are refracted away from each other and they never meet.

23. No matter what type of lens you have, the electromagnetic wave that passes through the center of the lens is not reflected or refracted.

24. Convex and Concave Lenses

25. What About Our Eyes?
The lens of your eye is a double convex lens.
Its job is to focus the image on the retina of the eye.

26. Farsighted
If one is farsighted, the lens in the eye causes the focus to be behind the retina. These people see far but have some difficultly seeing close-up. The lens focuses behind the retina because the actual eyeball is too short from front to back.
To correct this farsightedness, the person would wear glasses or contacts with convex lenses.
FARSIGHTED - focuses behind the eye
FARSIGHTED - Corrective Lense

27. Nearsighted
If one is nearsighted, the lens in the eye causes the focus to be behind the retina. These people see close-up but have some difficultly seeing far away. The lens focuses in front of the retina because the actual eyeball is too long from front to back.
To correct this nearsightedness, the person would wear glasses or contacts with concave lenses.
NEAR SIGHTED - Corrective Lense