Equipment: Single slit ray slide, lightbox, concave lens, and convex lens.
Method:
- Set up the lightbox, single-slit ray slide.
- Place the convex lens on the shaded area, place the lightbox at the top of the page and shine the single ray of light at the lens.
- Carefully trace the direction of the incoming and refracted rays.
- Repeat using the concave lens.
Conclusion:
When light passes through this type of lens, the rays all move away (diverge) from each other. One use of these lenses is in security peepholes in a door so that a person inside a room can see who is at the door without having to open it.
1. The lens described in the paragraph above is a concave lens.
When light passes through this type of lens, the rays all move towards (converge) each other. One use of these lenses is in a camera, to focus the light onto the film or digital sensor. Magnifying glasses also use this type of lens.
2. The lens described in the paragraph is a convex lens.
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