a short linear object of length "b" lies along the principal axis of a concave mirror of focal length "f" at a distance 'u' from the pole of the mirror.What is the size of the image?
a)b x root of u-f/f
b)b x root of f/u-f
c)b x root of [u-f/f]^2
d)b x root of [f/u-f]^2
please explain
2)
show that if a concave mirror produces virtual image, the image must be farther from the mirror than the object is.
3)a small plane mirror is placed 21cm in front of a concave mirror of focal length 21cm. an object is placed 42cm in front of the concave mirror. if the light from the concave mirror strikes the plane mirror where is the final image?