Question

for a concave mirror , paraxial rays are focused at distance R/2 from pole and marginal rays are focused at a distance x from pole then
x=R/2
2) x=-f
3) x R/2
4) x

Answer 1

Hope this will help you !!

Answer 2

Answer:

x<R/2

Explanation:

paraxial rays are those rays which makes small angle with principle axis while marginal rays make larger angles

:hence,paraxial rays converge at R/2while marginal rays converge before R/2