Refraction and reflection

We are working on Refection and Reflection, we had some equipment in a light box we could use to bend the light. At 10 degrees it bent the angle to 8 degrees. At 20 degrees it bent the light to 15 degrees. at 30 degrees it was 20 degrees. at 40 degrees it was 20 degrees as well. 

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 ray box, triple-slit ray slide and power supply.

2. Place the convex lens in the space on your paper. Place the ray box at the top of the page and shine the three rays of the light at the lens. Make sure the central light ray hits the lens at 90 degrees as indicated in the diagram. 

3. Carefully trace the direction of the incoming and refracted rays. 

4. Repeat using the concave lens. 

When the light 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 when the person on the inside of the room can see who is at the door without having to open it. 

That paragraph is call a Concave.

When light passes through this type of lens, they 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. 

That paragraph is called Convex.