Hurumanu 5 | Light | Reflection & Refraction | Refraction Through Lenses |

Aim: To investigate how different types of lenses refract light.
Equipment: Single slit ray slide, lightbox, concave lens, and convex lens.
Method: 

1. Set up the lightbox, single-slit ray slide. 
2. 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. 
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 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.