Answer to Question #182795 in Optics for Elessia

Question

The radius of curvature of the concave mirror is 60 cm. At what distance from the mirror should the object be placed so that the rays that came from the object to the mirror are reflected from the mirror, and then travel parallel to each other?(answer:30 cm)

Answer 1

Solution :-

Given

ROC = 60 cm

object be placed so that the rays that came from the object to the mirror are reflected from the mirror, and then travel parallel to each other

= 30 cm at focus

as we can see in ray diagram and also by mirror formula

mirror formula = $\boxed{\frac{1}{v}+\frac{1}{u}=\frac{1}{f}}$

when u = f

then V = $\infin$

$\implies$

rays will be parallel to incident rays

it will be more clear by diagram

as given below