Lens/object question

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

exquisitemelody

Full Member
10+ Year Member
Joined
Oct 18, 2010
Messages
247
Reaction score
0
If the image produced by a lens appears very close to its focal point, then the object must be very:

A. close to the lens
B. close to the focal point
C. close to the center of curvature of the lens
D. far from the lens

The solution is telling me the answer is D, but I don't understand why. I would think the answer is A. They say that using the lens/mirror equation, i is basically equal to f, which makes 1/o = 0....wouldn't that mean the object is CLOSE to the lens? Or am I just missing something?
 
If the image produced by a lens appears very close to its focal point, then the object must be very:

A. close to the lens
B. close to the focal point
C. close to the center of curvature of the lens
D. far from the lens

The solution is telling me the answer is D, but I don't understand why. I would think the answer is A. They say that using the lens/mirror equation, i is basically equal to f, which makes 1/o = 0....wouldn't that mean the object is CLOSE to the lens? Or am I just missing something?

Look at a graph of 1/x = y

When y is equal to zero, where is x? Remember that x = o which is the distance of the object from the lens.
 
Top