Question

A convex lens of focal length 20 cm is placed in contact with a concave lens of

focal length 10cm. What is the focal length and power of the combination?

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Answer 1

Answer:

hey mate!!

here is your answer...

Step-by-step explanation:

Focal of convex lens(f)=+20cm=20/100=+0.20 m

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

focal length of concave lens(f)=-10cm=-10/100=-0.1 m

P=1/-.1=-10D

power of combination=5-10=-5D

hope this will help uhh...

Answer 2

Answer:

if both lens are placed together so focal length is added

you dont understand i tell it to you in simple language

in convex lens focal length is negative

and in concave it is positive

so,focal length= -20+10= -10

and p=1/-f

so, power=0.1 dioptre

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Step-by-step explanation: