Lens Equation Homework

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1. What is the unit of lens power?
   
2. What is the abbreviation for this unit?
   
3. The power of a concave lens would be...
   Negative Positive

For each of the following questions, work out the focal length and state whether the lens is concave or convex. Please include the unit.

4. P = + 1.0 D, f = , <--choose--> convex concave
5. P = + 6.0 D, f = , <--choose--> convex concave
6. P = - 0.5 D, f = , <--choose--> convex concave
7. P = - 3.3 D, f = , <--choose--> convex concave

For each of the following questions, work out the power (remembering to decide if your answer should be positive or negative AND only to work with focal length in metres)

8. f = 1 m, concave lens, P =
9. f = 0.5 m, concave lens, P =
10. f = 3 mm, convex lens, P =
11. f = 4 m, concave lens, P =
12. f = 10 cm, concave lens, P =

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