The point on the principal axis of a convex lens, such that rays of light starting from it on passing through the lens, move parallel to the principal axis is called :
A. first focal point
B. second focal point
C. optical centre
D. aperture of lens
Answer:A
The point on the principal axis of a convex lens, such that rays of light starting from it on passing through the lens, move parallel to the principal axis is called :
A. first focal point B. second focal point C. optical centre D. aperture of lens