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Standard XII
Physics
NCERT
Question

If the focal lengths of a lens for marginal rays and paraxial rays are 12.5cm and 13 cm respectively, the longitudinal spherical aberration is
  1. 0.25cm
  2. 0.5cm
  3. 0.75cm
  4. 1cm

A
0.5cm
B
1cm
C
0.25cm
D
0.75cm
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