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4 cards from this section. Quick, good the night before a test.
What is the principal axis of a lens?
Think about what line helps us track light behavior.
Define the optical center of a lens.
This point is like an 'open door' for light.
What is the principal axis of a lens?
Think about how light interacts with the lens.
True or False: The optical center is where rays deviate when passing through a lens.
Recall the definition of the optical center.
If a convex lens has a focal length of 15 cm, at what distance from the lens will a parallel ray converge?
Recall how focal lengths dictate convergence points.
A concave lens has a focal length of -20 cm. Where do light rays appear to come from if they enter parallel to the principal axis?
Keep in mind the sign convention for concave lenses.
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