1 answer

2. If a thin lens focuses light from an obiect 2.0 m in front of it...

Question:

2. If a thin lens focuses light from an obiect 2.0 m in front of it on a screen 8.0 m behind the lens, what is the focal leng
2. If a thin lens focuses light from an obiect 2.0 m in front of it on a screen 8.0 m behind the lens, what is the focal length of the lens? Ans. +1.6 m

Answers

From lens formula,

1/f = 1/u + 1/v

here, u = distance of lens from object = +2.0 m

v = distance of image from lens = +8.0 m

f = focal length of lens = ??

So, 1/f = 1/2.0 + 1/8.0

f = (8*2)/(8+2)

f = +1.6 m

Please upvote.

.

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