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2 cards from this section. Quick, good the night before a test.
What is the lens formula for two lenses in combination?
Think about how individual lenses work together.
If a lens has a focal length of 20 cm, what is its power?
Remember the formula for power involves the focal length.
What does the lens formula help to determine?
Think about what the formula addresses.
True or False: The power of a lens is its focal length measured in meters.
Recall how power is defined and calculated.
A system has two lenses, one converging (f = 10 cm) and one diverging (f = -20 cm). What is the effective focal length and the total magnification if both lenses are used together?
Consider the signs of the focal lengths carefully!
Design an optical system with three lenses where the first lens has f = 15 cm, the second f = 10 cm, and the third f = -10 cm. What is the total effective focal length and power of the system?
Keep track of the positive and negative signs during calculations!
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