The focal length of a concave mirror is 20 cm. Where an object must be placed to form an image magnified two times when the image is real? |
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a) |
30 cm from the mirror |
b) |
10 cm from the mirror |
c) |
20 cm from the mirror |
d) |
15 cm from the mirror |
The focal length of a concave mirror is 20 cm. Where an object must be placed to form an image magnified two times when the image is real? |
|||
a) |
30 cm from the mirror |
b) |
10 cm from the mirror |
c) |
20 cm from the mirror |
d) |
15 cm from the mirror |