Suppose you have a lens with a focal length of 10 cm, about 4 inches. This is ty

Question

Suppose you have a lens with a focal length of 10 cm, about 4 inches. This is typical of large magnifying glass. Let's use the lens to form an image of distant trees on a piece of paper, and then again of a light bulb 8 inches (about 20 cm) away. What happens? Pick the two answers that are correct.

-The lamp focuses on the paper also when the paper is 4 inches, 10 cm, behind the lens.

-The lamp does not come into focus. There's no way to use this lens to form an image of the lamp.

-The lamp focuses behind the lens too, but at 8 inches rather than 4.

-The trees focus at 4 inches, 10 cm, from the lens.

Explanation / Answer

The lamp focuses on the paper also when the paper is 4 inches, 10 cm, behind the lens.

The trees focus at 4 inches, 10 cm, from the lens.

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