PhysQuiz Practice Problems

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 1
A convex lens having focal length of cm. is located 75 cm. from an object. How far from the lens will the image be formed?

 2
The image of a man on a piece of film is 3.21 cm tall. Inside the camera, the film was located cm. from the lens. If the man himself is 6 feet tall (6 feet = 183 cm.) How far (in cm) from the camera was the man when the picture was taken?

 3
In the picture mentioned in problem 2, the image of the man's son is cm tall. What is the actual height of the man's son (in cm)?

 4
In order for a real image to be formed by a convex lens, which of the following must be true?
1. The object must be right-side-up.
2. The object must be located at a distance of at least twice the focal length of the lens.
3.The object must be located at a distance greater than the focal length of the lens.
4. The object must be inverted.

 5
In order for the image formed by a convex lens to be erect and magnified, which of the following must be true?
1. The object must be placed inside the focal length of the lens.
2. The focal length of the lens must be greater than the size of the object.
3. The focal length of the lens must be smaller than the size of the object.
4. The object must be larger than the diameter of the lens.

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