Question

A convex lens of focal length 20cm and a concave lens of focal length 10 cm are placed in contact. Find the equivalent focal length

Answer 1

Answer:

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

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Answer 2

Answer:

this is your answer mate⬆⬆⬆