SOLUTION: 68. Telephoto lens. Use the formula from Exercise 67 to find the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens. it is the formula 1/f=1/o+1/

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: 68. Telephoto lens. Use the formula from Exercise 67 to find the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens. it is the formula 1/f=1/o+1/      Log On

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Question 203468This question is from textbook
: 68. Telephoto lens. Use the formula from Exercise 67 to find
the image distance i for an object that is 2,000,000 mm from
a 250-mm telephoto lens.
it is the formula 1/f=1/o+1/i

thanks so much
 This question is from textbook

Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
1%2Ff=1%2Fo%2B1%2Fi
where f = focal length, o = object distance, i = image distance
Given, o = 2000000 mm, f = 250 mm.
Substituting these in the given equation
1%2F250=1%2F2000000%2B1%2Fi
1%2Fi=1%2F2000000+-+1%2F250
1%2Fi=%281-8000%29%2F2000000
i=-2000000%2F7999=-250 mm (approximately)

P.S.: The minus sign indicates that the object and image are on the opposite sides of the lens.