What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

a

20cm

b

15cm

c

10cm

d

5cm

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Correct Option
c

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Discussions (9)

Sciencehigh2
10 years ago

1/f =1/u -1/2u = 1/20=1/u -1/2u 1/20=1/2u...u=20/2 =10cm

Dgcftghjgf
1 year ago

the answer is supose to be u= 30

Olasubo
1 year ago

i got 30cm

Ch1zu111
9 months ago

Myschool is tupid

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