A lamp post 4.2 m tall stands 15 m from you.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A lamp post tall stands from you. The lens of your eye is from the retina. How tall is the image of the lamp post on your retina? Is it upright or inverted?
Need a reminder? The key ideaShow
The cornea and the eye lens form a real, inverted, small image on the retina, about behind the lens. The iris sets the size of the pupil. The ciliary muscles change the lens (accommodation). A normal eye sees clearly from its near point, about , to its far point at infinity.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The rule. .
Step 2. The numbers. .
Answer: tall, and inverted.
Check. A real image made by a convex lens system is inverted; the brain turns it upright.
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