Question

Consider a concave mirror with a focal length
of 14.98 cm.
a) Find the image distance when the object
distance is 14.98 cm

Answer 1

The image is at infinity in that case.

Answer 2

Why is it infinity?

Answer 3

Because the optics rule is:
1/do + 1/di = 1/f

Since do = f, the focal length,
1/di = 0

That can only happen if the image distance di is infinity.

Answer 4

Consider a concave mirror with a focal length
of 14.98 cm.
a) Find the image distance when the object
distance is 14.98 cm. (Answer with −1000 if
the image does not exist.)

That's the whole question..