Aim: To investigate how different types of lenses refract light.
Equipment: Triple-slit ray slide, power supply, a concave lens, and a convex lens.
Method:1) Set up a ray box, triple-slit ray slide, and power supply.
2) Place the convex lens in the space below. Place the ray box at the top of the page and shine the three rays of light at the lens. Make sure the central light ray hits the lens 90-degree angle as indicated in the diagram.
3) Carefully trace the direction of the incoming and refracted rays.
4) Repeat using the concave lens.
Conclusion:
When light passes through this type of lens, the rays all move away (diverge) from each other. One is of these lenses is in security peephole 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 above is a Convex lens.
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