Suppose we have a focal length of 25mm. What minimum object distance is considered to be...

Question

Question

Suppose we have a focal length of 25mm. What minimum object distance is considered to be an "infinite" distance away?

A. 2.5m

B.2.5mm

C. 0.25m

D. 2.5cm

Answer 1

Answer #1

2.5 cm

25mm=2.5 cm

If the object is at infintiy, image will be formed at focal length of the lens

Then from lens formul 1/f=1/u+1/v

f=2.5cm

v=2.5cm

u=infinity

Answer 2

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