derive the mirror formula and give me the tips to learn the mirror formula well.

Dear Student,

 

Refer to the ray diagram below:

 

 

 

We use similarity between various triangles.

 

Using triangles 2 and 3,

 

(1)

(2)

(3)

(4)

(5)

For a concave mirror f is positive. For a convex mirror, f is negative.

 

Hope that satisfies your query.

 

Regards

Team

TopperLearning