Recent content by Boxter

I still don't understand. The point I'm trying to make is that I don't know how to get the common denominator when there's a fraction and a number. I just need someone to tell me how.

Please help someone

Homework Statement A convex mirror of focal length 10cm forms an image that is one quarter the size of the object. Find the position of the object and the image. Homework Equations -1/f = 1/u + 1/v m = v/u The Attempt at a Solution m = 1/4 f = 10cm -1/10 = 1/u + 1/0.25u I think...

If I divide 3 into 20 I get 6.666667. If I add 6.6667 to 20, is that how I get the real height, then take 6.66667 from 20 to get virtual height?

Magnification is 3 ??

I have the answers on the back of the book but can't figure out how to get it

Sorry, but I still don't understand :confused:

Homework Statement A concave mirror of focal length 20cm forms an image which is three times the height of the object. Find the distance of the object from the mirror if: 1: The image is real 2: The image is virtual...