Sign Convention for refracting surfaces: When the object faces a convex refracting surface, the radius of curvature r is positive. ... A converging or convex lens can form a real image (if the object is outside the focal point) or a virtual image (if the object is inside the focal point).
What is normal to the refracting surface?
A line perpendicular to the surface is imagined at the point of refraction. This line is called a normal. In this context the word normal means perpendicular. ... The angle between the refracted ray and the normal is called the angle of refraction, or the refracted angle.
What is power of refracting surface?
The surface power P is the reciprocal of the focal length of the surface. The ray incident ray crosses the surface from medium 1 with refractive index n1 into medium 2 with refractive index n2.
