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Byju's Answer
Standard X
Physics
Pole of a mirror
Distance betw...
Question
Distance between focus and optical centre of a lens is called ....................
A
Focal plane
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B
Focal length
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C
Focus
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D
Principal axis
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Solution
The correct option is
B
Focal length
Focal length is the distance between focal point and the optical center of the lens.
Answer-(B).
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Q.
Define the following terms for a lens:
(a) optical centre
(b) principal axis
(c) principal focus
(d) focal length