Question

A convex lens of focal length 20cm is put in contact
with a concave lens of focal length 40cm. Find the
focal length and power of the combination? ​

Answer 1

Answer:

1

Secondary School Physics 13 points

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10 cm.calculate (1) power of each lens,(2) power of combination

Ask for details Follow Report by Sursin8494 13.08.2018

Answers

ajayshotia

ajayshotia Ace

Focal of convex lens(f)=+20cm=20/100=+.20 m

P=1/f=1/.20=100/20=+5D

focal length of concave lens(f)=-10cm=-10/100=-.1 m

P=1/-.1=-10D

power of combination=5-10=-5D