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3 cards from this section. Quick, good the night before a test.
What is the lens formula?
Think of the relation between focal length, image distance, and object distance.
How do you determine if an image is real or virtual?
Recall the sign convention.
What does the lens formula relate?
Consider all elements involved.
True or False: The image distance in a concave lens is always positive.
Refer to the definitions of real and virtual images.
A convex lens has a focal length of 15 cm. An object is placed 20 cm from the lens. Find the image distance and describe the nature of the image.
Carefully substitute values into the lens formula and evaluate.
If a concave lens forms a virtual image of an object at 10 cm, and the focal length is -5 cm, determine the object distance.
Use the lens formula carefully to derive the object distance.
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