| A | B |
|---|
| How does a light bulb in a large room give you a sense of general illumination of the room? | All of the light rays it creates eventually reflect their way into an area of the room near your eye. |
| True or False When a lens bends light, some of the light is lost in the process. | False |
| What is image distance? | The distance between the lens and the image. |
| What is object distance? | The distance from the object to the lens. |
| What is focal length? | The distance between the lens and the focal point. |
| Technically speaking, what must the object distance be? | So great that the rays moving from the object to the lens are essentially parallel. |
| The focal length is a property of what? | the lens |
| The largest contributor to the sizing of an image displayed on the retina is what? | The cornea |
| The second largest contributor to the sizing of an image displayed on the retina is what? | The lens |
| What is the distance between the object and lens called? | The object distance |
| What is the distance between the lens and the focal point called? | The focal length |
| True or False: Transparent materials (like water) affect the path of light when it enters or leaves the material. | True |
| How fast is the speed of light in a transparent material compared to its speed in air? | It is slower (unless the transparent "material" is a vacuum/empty space) |
| When light travels from point A in air to point B in water, will it maximize or minimize its path in air? | maximize |
| When light travels from point A in air to point B in water, will it maximaize or minimize its path in water? | minimize |
| The bend of light as it travels from air to water is an example of what? | Refraction |
| Define refraction | The change in direction of a wave when it crosses the boundary between two media in wich the wave travels at different speeds. |
| What is a medium? | The material through which a wave travels. Ex. air, water, or glass |
| Do the angle of incidence and angle of refraction always equal one another? | No |
| Who derived the law of refraction? | Dutch astronomer W. Snell |
| In what year was the law of refraction derived? | 1621 |
| The law of refraction is now called what? | Snell's Law |
| What is the angle of refration? | The angle between the path light takes after changing mediums and the normal. |
| What is Snell's Law? | When light crosses a boundary between two different transparent materials, it bends according to the anle of iincidence and the properties of the materials. |
| When light enters glass from air at an angle of iincidence of 30 degrees, with the anle of refraction be larger or smaller than 30 degrees? Why? | Smaller, because light will minimuze its time in the thicker medium |
| How can light travel in a straight line from air, through a prism with straight non-parellel sides, and back into air again? | It cannot |
