Question 1
If you stand closer to a concave mirror than a distance of one focal length, the image you see is
◦
real and inverted.
◦
real and upright.
◦
virtual and inverted.
◦
virtual and upright.
◦
none of the above because you do not get an image.
Question 2
Ilona and Olivia observe a virtual image formed by an object placed a distance
in front of a convex lens of focal length
f. They argue about where to place a concave lens of focal length
−f to have a virtual image at the same location relative to the lens that they had with the convex lens. Ilona says that the object should also be placed a distance
in front of the concave lens. Olivia says that this won't work. Which one, if either, is correct, and why?
◦
Ilona, because concave and convex lenses produce virtual images at equal image distances when the object distances are equal.
◦
Ilona, because both p and q are negative for a concave lens.
◦
Olivia, because both p and q are positive for a concave lens.
◦
Olivia, because if
, then
p was
p =
∞.
◦
Olivia, because if q = −f, then p was p = ∞.
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