Station two
(allowed 5 minutes)
The following diagrams show a pair of binocular and its inside arrangement. 

With reference to left diagram, answer the following questions:

a. What is a, b and c?
b. What are the uses of b?
c. What distance does the light need to travel between a and c?
d. What is the effect of doubling the diameter of a?






Go to station 3
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