Question

Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
A) -4.33 diopters B) 12.33 diopters C) -12.33 diopters D) 4.33 diopters

Answer 1

Answer:

ANSWER

v

1

−

u

1

=

20

1

v

1

−

(−25)

1

=

20

1

v=100cm (@ centre of curvature)

R=50

f=

2

50

=25cm