Question
Your camera may have a zoom lens, ranging between wide angle (short focal length) and telephoto (long focal length). How does the size of an object in the camera's focal plane differ between wide angle and telephoto?
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The focal length is the distance between the focal plane and the main lens of the camera or telescope. Show more…
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An object is very far from the front of a thin converging lens. As the object approaches the lens, still farther than one focal length from it, what happens to the size of the image?
What is the focal length of a lens? the distance between the object and the image distance between the object and the center of the lens the distance between the center of the lens and the image the distance between the focal point and the center of the lens
A camera has a lens with a focal length of $60 . \mathrm{mm}$. Suppose you replace the normal lens with a zoom lens whose focal length can be varied from $35 . \mathrm{mm}$ to $250 . \mathrm{mm}$ and use the camera to photograph an object very far away. Compared to a 60.-mm lens, what magnification of the image would be achieved using the $240 .-\mathrm{mm}$ focal length?
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