Difference between convex lens formula and convex mirror formula

[yjk91]

Homework Statement

difference between convex lens formula and convex mirror formula

The Attempt at a Solution

for convex mirror you make focal point negative and use the 1/f = 1/do + 1/di

but for convex lens do you do the same?

you don't make the f negative i think am i right?

thank you

 

[Mike Pemulis]

Correct. So for the record, the sign convention for f is:
Positive: Concave mirror, convex lens
Negative: Convex mirror, concave lens

 

[yjk91]

thank you