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Lenses
Chapter 4
| Question | Answer |
|---|---|
| What is a convex lens | Thicker at the centre than at the sides |
| What is a concave lens | Thicker at the sides than at the centre |
| What is the optic centre | The centre of the lens |
| What is the principal axis | The straight line through the optic centre that is at right angles to the face of the lens. |
| What is another name for a convex lens and why | A convex lens changes a parallel beam into a converging beam. That’s why it’s also called a converging lens. |
| What is another name for a concave lens and why | A concave lens changes a parallel beam into a diverging beam. That’s why it’s also called a diverging lens. |
| What is a Real Image | A real image is an image formed by the actual intersection of light rays. Such an image can be located on a screen |
| A light ray going into a converging lens Parallel comes out which way | Through the focus point |
| A light ray going into a converging lens through the Focus point comes out which way | Parallel |
| What happens when the object is outside 2f | The real image is diminished |
| What happens when the object is at 2f | The real image is the same size as the object and at 2f on the other side of the lens. |
| What happens When the object is between 2f and f | The real image is magnified. The nearer to f the object is placed, the larger the image. |
| A light ray going into a converging lens through the optic centre comes out which way | Through the optic centre |
| What is a Virtual Image | A virtual image is an image formed by the apparent intersection of rays. A virtual image cannot be formed on a screen. |
| When is a virtual image formed | When the object is in front of f |
| What happens to a virtual image the closer it is to f (focus point) | The nearer the object is to f, the farther the virtual image is from the lens. |
| WHat happens when an object is at f | With the object at f, the image is at infinity. |
| What can a converging lens be used as | A converging lens being used as a magnifying glass |
| How do rays arrive at a lens from a long distance | parallel |
| what does u stand for | is the distance from the object to the optic centre. |
| What does v stand for | is the distance from the image to the optic centre. |
| what does f stand for | is the focal length of the lens. |
| What is the formula for a real image | 1/u+1/v=1/f |
| What is the formula for a virtual image | 1/u-1/v=1/f |
| A light ray going into a Diverging lens through the Optic centre comes out which way | through the optic centre |
| A light ray going into a converging lens heading for the Focus point comes out which way | Parallel to the principal axis |
| A light ray going into a converging lens travelling parallel to the principal axis comes out which way | As if it came through the focus |
| What type of image is always formed from a diverging lens | The image in a diverging lens is always: Virtual Upright (the right way up) Diminished |
| What happens the closer the objects is to the lens | The nearer the object is to the lens, the bigger it appears |
| What is the formula for diverging lenses | 1/u-1/v=-1/f |
| What is a use of lenses in technological and medical contexts | Correcting Vision The camera The microscope Astronomical telescope |
| What lens do you need to help a short sighted person | Diverging lens |
| What lens do you need to help a long sighted person | Converging lens |
Created by:
21JulianM
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