Question

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Define the terms
optic centre
prinsipal axis
focal length​

Answer 1

1). optical centre: a point in the lens on principal axis,such that any ray directed towards it emerges without deviation is called as optical centre of the lens..

2). Focal length: The distance of the principal focus from the optical centre of the lens is called focal length of the lense.

3). Principal axis: A line passing through the centre of the curvature of both the faces forming the lens is called the axis of the lens..

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Answer 2

Answer:

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Explanation:

1-The Optical centre of the lens is defined as the point which lies on the principal axis through the rays of light passes without any deflection or it can be defined as the central point of the lens through which a ray of light passes without suffering any deviation.

2-Each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.

3-The distance between the centre of a lens or curved mirror and its focus.