7. When an object is brought close to a
concave mirror, the image becomes
A. smaller
B. inverted
C. enlarged D. all the above
8. What happens to the image in a
concave mirror when the object is
moved away from the mirror?
9. Is it possible to obtain an image of
the same size as the object with a
concave mirror? Why or why not?
10. If you are asked to burn paper using
a mirror, how will you do it? Which
mirror will you use?
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Answers
Answer:
7. B and D
8. When the object is far from the mirror, the image is inverted and at the focal point. The image is real light rays actually focus at the image location). As the object moves towards the mirror the image location moves further away from the mirror and the image size grows (but the image is still inverted). When the object is that the focal point, the image is at infinity. As the object moves towards the mirror inside the focal point the image becomes virtual and upright behind the mirror. Initially the virtual image is much larger than the object and really far away, but as the object approaches the mirror the virtual image also approaches the mirror and decreases in size.
9. No. Real images can be larger than the object, smaller than the object, or the same size as the object. 7. The famous Chinese magician, Foo Ling Yu, conducts a classic magic trick utilizing a concave mirror with a focal length of 1.6 m.
10. Concave mirror focuses the parallel sun rays at focal point of the mirror. So with a small concave mirror we can heat up and burn a paper