Question

answer this question fast​

Answer 1

Explanation:

• optical center: a point on the axis of a lens thatso located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.
• focal point : the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
• focal length : the distance between the centre of a lens or curved mirror and its focus.
• centre of curvature : the centre of a circle which passes through a curve at a given point and has the same tangent and curvature at that point.
• radius of curvature: the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.
• principle axis : each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.