Question

The focal length is minus 3 then, what is magnification

Answer 1

Answer:

Since this is a concave mirror and there is a

M > 1.0 then the object is closer to the mirror than the focal length

The formula for magnification is

Hi/Ho = f/So = So/f = [v/u]

Since f = 10 cm then 3 = 10/So so. So = 3.33

Now the distance from the focal point to the image is 3.33, and the image is between the focal point and the mirror. Therefore the object is 6.66 cm from the mirror.