The distance between the optical centre and centre of curvature of a lens is 18.6 cm, then its focal length is ?
a) 37.2 cm
b)18.6 cm
c) 0 cm
d) 9.3 cm

Question

The distance between the optical centre and centre of curvature of
a lens is 18 6 cm, then its focal length is ?
a) 37 2 cm
b)18 6 cm
c) 0 cm
d) 9 3 cm

Dinesh Pandey · Accepted Answer

Dear Student,

Distance between optical centre and centre of curvature, R=18
6 cmf=R2f=18 62=9 3 cm

The distance between the optical centre and centre of curvature of a lens is 18.6 cm, then its focal length is ? a) 37.2 cm b)18.6 cm c) 0 cm d) 9.3 cm

The distance between the optical centre and centre of curvature of a lens is 18.6 cm, then its focal length is ?
a) 37.2 cm
b)18.6 cm
c) 0 cm
d) 9.3 cm