The way it appears to me is that after light enters the un-silvered surface it refracts then it does not refract but directly hits the silver surface and reflects. In this case we need to use the following formula:
μ2/v – μ1/u = μ2-μ1/R
at the two refractions, instead of the lens formula. What’s wrong in my thinking?
P.S. This is my first post, sorry that i didn’t use the template, i don’t see how i can format my question like that