What Are the Properties of Concave/Convex Spherical Mirrors?

[mglander]

Spherical mirrors. We are given p= +18 and the mirror is concave with f= 12. Find r, i, m, Real or Virtual, Imaginary or not imaginary, and what side of the mirror is the image on. All units are cm.

r: f=r/2, so r=2f r= 24 cm
i: (1/p) + (1/i)= (1/f), so (1/f)-(1/p)=(1/i) i= 36 cm
m: m=-i/p m=-2

At that point, how do you know whether the image is Real or Virtual and Imaginary or Not Imaginary?

 

[Ackbach]

Here's a good link to explain it all:

https://www.pa.msu.edu/courses/2000fall/PHY232/lectures/lenses/images.html