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## Homework Statement

the focal point is said to be real and positive for concave mirrors and virtual and negative for convex spherical mirrors. what if the problem gives you the focal point for a spherical convex as 15 cm. am I supposed to take it that the the focal point should be plotted one the positive side, or am I supposed to make it negative in my solution since I know that f is negative for convex mirrors?

## Homework Equations

none

## The Attempt at a Solution

it isn't that type of problem.