Question

Two thin lenses of focal length +10 cm and - 5 cm are in contact, find power of this
combination of lenses.
Son​

Answer 1

Answer:

first focal length of the thin lens is = +10 cm

power of lens = 100/F in cm

=100/10

,, = 10 D

than power of the second focal length is = -5 cm

power of lens = 100 /F in cm

= 100/ -5

, = -20 D

power of combination is P= p1+p2

;; = -20+10

= -10 D

I HOPE THIS HELPS YOU.