The point on the principal axis at which rays parallel to principal axis meet after reflection:
Answers
Answer:
The focal point is the point in space at which light incident towards the mirror and traveling parallel to the principal axis will meet after reflection.
Answer:
The point on the principal axis at which rays parallel to the principal axis meet after reflection is the principal focus.
Explanation:
A principal focus of a mirror or lens will be half the distance of its radius of curvature. The rays which are parallel to the principal axis will always travel through this point or they appear to travel through this point.
In a concave mirror, the light rays will converge to the principal focus after reflection while in a convex mirror the light rays appear to diverge from a common point, which is its principal focus.
In a concave lens, the parallel rays will appear to diverge away from a common point after refraction. This is the principal focus of a concave lens. In a convex lens, these rays will refract to converge to a common point which is its principal focus.