VISIBLE LIGHT

LIGHT EXPECTATIONS 1.LIGHT INTERACTS WITH MATTER BY REFLECTION, ABSORPTION OR TRANSMISSION. 2. THE LAWS OF REFLECTION AND REFRACTION DESCRIBE THE RELATIONSHIPS BETWEEN INCIDENT AND REFLECTED/REFRACTED WAVES.

LIGHT 2. THE SPEED OF LIGHT IN EMPTY SPACE TRAVELS AT 3 X 10 8 M/S. WHEN TRAVELING THROUGH A TRANSPARENT MEDIUM, THE SPEED DEPENDS ON THE MEDIUM. 1.Visible light is found in the _________ of the electromagnetic spectrum. It is called white light but can be broken into the colors always in the order of ROY GBIV.

3. REFRACTION OF LIGHT – -LIGHT CAN BE TRANSMITTED THROUGH TRANSPARENT MEDIUMS (Ex. GLASS, WATER). -LIGHT REFRACTS (BENDS) WHEN IT CHANGES SPEED. USUALLY LIGHT CHANGES SPEED WHEN IT CHANGES MEDIUMS.

4. LIGHT REFRACTED BY A CONVEX LENS. The image seen through a convex lens is upside down.

5. REFRACTION OF LIGHT THROUGH A CONCAVE LENS. The image formed is always smaller than the object and right-side up.

6. Light can be reflected (bounced) off of barriers such as a mirror. 7. Remember – The Law of Reflection : The angle of incidence is equal to the angle of reflection.

8. A PLANE (FLAT) MIRROR FORMS A VIRTUAL IMAGE OF YOU BEHIND THE MIRROR.

-REFLECTIONS CAN ALSO COME FROM CURVED SURFACES. CONCAVE- CURVES IN CONVEX – CENTER STICKS OUT

9. REFLECTION OFF OF A CONCAVE MIRROR. -THE IMAGE IN A CONCAVE MIRROR IS UPSIDEDOWN.

10. REFLECTION OFF A CONVEX MIRROR. THE IMAGE IS RIGHT- SIDE UP AND SMALLER THAN THE OBJECT.

11. The path of light reflected off of a rough surface is scattered. The image appears distorted and is called a diffuse image.

-Reflection off a rough surface = a diffuse image.

12. When visible light interacts with a medium (substance) 3 different things can occur: a.Transmitted – the light passes through the substance. Example = b. Reflected – the light bounces off the substance. Example = c. Absorbed – the light is “sucked” into the the substance. Example =

-Substances that interact with light can also be described in three ways: Transparent – allows all light through Example - b. Translucent – allows some light through. Example - c. Opaque – no light can pass through. Example -

Why is the sky blue? Why are sunsets red?

13. The sky is blue because blue light (which has a short wavelength) is scattered by particles in the atmosphere as it passes from space down to us on Earth.

14. The sky is red at sunset because we are at a different angle to the sun. This means the light must pass through more particles in the atmosphere. The short wavelengths (blue, purple) do not make it leaving the reds, oranges, yellows and a beautiful sunset.

A RAINBOW IS FORMED WHEN WATER DROPLETS IN THE AIR REFRACT AND DISPERSE THE LIGHT CREATING A MAGNIFICENT SHOW IN NATURE.

15. SEEING COLOR - OUR EYES ONLY SEE COLORS THAT ARE REFLECTED FROM SURFACES. THE OTHER COLORS OF LIGHT ARE ABSORBED BY THE OBJECT THE LIGHT STRIKES. -EXAMPLE- A RED APPLE APPEARS RED BECAUSE THE APPLE ABSORBS ALL WAVELENGTHS OF LIGHT EXCEPT. THE RED IS REFLECTED.

ARE YOU COLORBLIND? TRY TO READ THE NUMBER BELOW.