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3 cards from this section. Quick, good the night before a test.
What is the lens formula?
Recall the relationship between focal length, image, and object distances.
What does magnification indicate?
Consider the sizes of the image and object.
What does the lens formula express?
Think about the use of lenses in optics.
The power of a lens is inversely related to its focal length. True or False?
Consider how power is defined mathematically.
A lens produces a virtual image that is twice the height of the object being viewed. If the object is placed 10 cm away from the lens, what is the distance to the lens required to produce this image?
Remember the characteristics of virtual images.
A lens has a focal length of 15 cm. If an object is placed 30 cm from the lens, where will the image be located?
Use the formula clearly and track the signs carefully.
6 more questions in this section. Enroll free to practise them all.
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