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RRB GROUP D 202527 Nov Shift 1

Question #11991

The power of a lens is defined as:
A
The reciprocal of its focal length in meters
B
The ratio of image distance to object distance
C
The product of its focal length and refractive index
D
The square of its focal length
Explanation
Power of a lens is mathematically the reciprocal of focal length expressed in meters.
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Question Snapshot
  • CategoryRRB
  • Exam TypeRRB GROUP D
  • Year2025
  • Question ID#11991
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