Unit: Geometric optics
Year: 1997 Question#: 90
Question: At what distance from the mirror could the object be placed to produce a virtual image of the object?
(1 ) 0.05 m
(2 ) 0.10 m
(3 ) 0.30 m
(4 ) 0.50 m
What is this question really asking?
Explanation by: Clayton B.
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Answer 1
0.05 m
CORRECT
For all concave mirrors, an object placed between the mirror and the focus will form a virtual image. 0.05 m is the only distance closer than the focus 0.10 m away. return to top
Answer 2
0.10 m
INCORRECT
Any object placed at the focus will form a beam, not a virtual image.
return to top Answer 3
0.30 m
INCORRECT
Any object placed beyond the focal point of a concave mirror forms a real image.
return to top
Answer 4
0.50 m
INCORRECT
Like answer 3, this answer is also farther away from the mirror than the focal point. The reflected image is a real one. return to top
What's this question really asking?
For a concave mirror, at what location is the image behind the mirror (real)? return to top
