When doubling your distance your intensity decreases by a factor of four. This is because light intensity is inversely proportional to the square of the distance.

11. Why is it that you can determine the frequency of any form of electromagnetic wave if you

know the wavelength?

Electromagnetic waves travel at c = 3 x 108m/s. So the equation c =f has 2 known values to solve for the 3rd. (true for all electromagnetic waves)

12. How do the speeds of different forms of electromagnetic radiation compare?

All the same speed (c=3 x 108m/s)

13. What region of the electromagnetic spectrum do we use when we see things?

Visible light

14. What region of the electromagnetic spectrum is used for television transmissions?

Radio wave

6. How is a rainbow formed?

Dispersion

A rainbow is formed through the interaction of sunlight and water droplets, through the process of refraction,reflection and dispersion.

Water droplets are disappeared into different colors.Then the light rays reflect offf the back of the droplet to a viewer with red light on the bottom and violet on the top. The violet light from these droplets is higher in the air is not seen -only red ones. Violet light from the lower droplets are seen with the rays, the red end of the spectrum being unseen.

7. How does atmospheric refraction affect sunrise and sunset.

Atmospheric refraction is the bending of light rays passing through earth. This causes us to see the sun before it actually comes over the horizon during sunrise and sunset.

8. How do mirages form?

Mirages occur when light that would normally hit the ground is refracted up due to warmer air.

9. What is the critical angle and how does it relate to total internal reflection.

Critical angle

10. How do the focal lengths of converging and diverging lenses differ?

Covering lenses have positive focal lengths, and diverging lenses have negative focal lengths.

11. What sign does a virtual image have and where does it form?

A virtual image has a negative sign for the image distance and is formed on the same side of the lens as the object. (q is negative)

12. What sign does a real image have and where does it form?

A real image has a positive image distance and form of the opposite side of the lens as the object.

13. What kinds of images can a converging lens form?

Both real and virtual images

14. What kinds of images can a diverging lens form?

Virtual,upright, and smaller images

15. What do light rays have to do in order to form a real image?

The light rays must converge after passing through the lens or reflecting off the mirror, allowing them to meet at a point in front of the lens or mirror.

16. When does light refract toward the normal and when does it refract away from the

normal?

Light refracts toward the normal when it passes from a less optically dense medium (such as air) into a more optically dense medium (such as water or glass). Conversely, light refracts away from the normal when it travels from a more optically dense medium to a less optically dense one.
17. How is light speed affected when it passes from one medium to another?

When light passes from one medium to another, its speed changes. The amount of this change depends on the properties of the two media, specifically their refractive indices.

18. When does light NOT refract?

Light does NOT refract when one substance isn’t transparent, if the angle from normal is 0, or if both of the substances have the same index of refraction, n.

19. What is refraction?

Refraction is the bending of light through a medium

Note