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
Hoverbike drone project for air transport takes off
Earlier Stone Age artifacts found in Northern Cape of South Africa
Study reveals new characteristics of complex oxide surfaces