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Across
4.used as car headlights
6.the distance from the focal point to the center of the lens is called
7.the angle between a ray that strikes a surface and the normal to that surface at the point of contact
9.the focusing of different colors of light at a difference distance behind the lens
11.it is derived using the assumption that the lens is very thin
12.designed to help someone who has problems seeing at distance (myope)
14.an image formed by light rays that only appear to intersect
16.an outwardly curved, mirrored surface that is a portion of a sphere and that diverges incoming light
17.the eye also contains small lens, that refracts light as well
18.an image formed when rays of light actually intersect at a single point
19.the image created is always a virtual, smaller image
20.mirrors focus light to form real images
Down
1.often used for close examination of small objects
2.the measure of how large or small the image is with respect to the original object's size
3.Drivers use it to get a wide view of the whole traffic coming from behind.
5.is a converging lens and an example of simple magnifier
8.act like a lens, directing light rays toward the light sensitive retina
10.the angle formed by the line normal to a surface and the direction is reflected ray moves
13.the ratio of image height to object height
15.curved surfaces change the direction of light by refraction

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