Question

the focal length of a convex lens is 30 cms. what is the distance of its centre of curvature from its focus

Answer 1

Answer:

30 cm

Explanation:

now we know that

C = 2f

so,

from figure and formula

AC = 2BC

AC = 2 × 30cm = 60 cm

we need to find

AB

Now

AB = 1/2AC

Therefore ;

AB = 1/2 × 60 cm = 30 cm

Hence, the distance of centre of curvature and its focus is 30 cm