Question : For reflection through spherical surfaces, the normal at the point of incidence is
A. perpendicular to the principle axis and passes through the centre of curvature
B. perpendicular to the focal plane and passes through the pole.
C. perpendicular to the tangent plane at pole and passes through the focus.
D. perpendicular to the tangent plane at the point of incidence and passes through the centre of curvature.
Answer:D
Question : For reflection through spherical surfaces, the normal at the point of incidence is
A. perpendicular to the principle axis and passes through the centre of curvature B. perpendicular to the focal plane and passes through the pole. C. perpendicular to the tangent plane at pole and passes through the focus. D. perpendicular to the tangent plane at the point of incidence and passes through the centre of curvature.