Concept explainers
A lens, a bulb, and a screen are arranged as shown below. A sharp, inverted image of the filament (not shown) appears on the screen when it at the location shown.
Predict how each of the following changes would affect what you see on the screen. Support tour predictions with one or more ray diagrams.
• The screen is moved closer to farther from the lens
• The top half on the lens is covered by a mask.
Does your answer depend on which side of the lens the mask is placed? If so, how? If not, why not?
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