You should be familiar with the lens and mirror focusing equation. Here's a chance to learn them and try them out.
For a real image formed by a concave mirror:
1/Do + 1/Di = 1/f = 2/R
You don't need to height of the object to compute the radius, R.
Di = 11.2 and Do = 8.5.
To have a magnification of 11.2/3.5 = 3.2, you must have Di/Do = 2.2
Since you now know R, you can use the mirror equation to solve for the new object distance Do
An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror.
How far from the mirror is it necessary to place the above object in order to have a virtual image with a height of 11.2 cm?
1 answer