View Single Post
May3-09, 02:26 AM
P: 192
1. The image of the moon is formed by a concave mirror whose radius of curvature is 4.20 m at a time when the moon's distance is 3.8 x 10^5 km. What is the diameter of the image of the moon if the diameter of the moon is 3480 km?

2. 1/f = 1/do + 1/di
M = hi/ho = - di/do

3. 1/f = 1/do + 1/di
di = dof/do - f
= 3.8 x 1065(0.0042)/3.8 x 10^5 - 0.0042
= 0.0042 km

hi/ho = - di/do
hi= ho (- di/do)
= 3480(-0.0042/3.8 x 10^5)
= -3.8 x 10^-5 km

I'm not sure if this is right. I also have some questions how do you know if it is concave or convex (lens/mirrors if the book doesn't say it), what's the difference between mirrors and lens, and how do you tell if its a converging lens or a diverging lens whats the difference between them. Thank You!! :]
Phys.Org News Partner Science news on
Wearable 4MM jetpack tested on speed, agility for runners (w/ Video)
How did evolution optimize circadian clocks?
Corn spots: Study finds important genes in defense response