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Question
The distance between the principal focus and optical centre is called ______.
Options
displacement
radius of curvature
focal length
light year
MCQ
Fill in the Blanks
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Solution
The distance between the principal focus and optical centre is called focal length.
Explanation:
By definition, the distance from the optical centre of a lens to its principal focus is called the focal length. Radius of curvature is the radius of the sphere of which the lens surface is a part.
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