The image of an object kept at 30 cm from the pole of a convex mirror forms at 10 cm. What
is the focal length of the mirror?
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Using the Real Is Positive convention:
u=+30 and f=-10
1/u+1/v=1/f
1/30 + 1/v = -1/10
1/v = -1/10 - 1/30 = -3/30 - 1/30 = -4/30
v = -30/4 = -7.5 cm meaning virtual and erect. And quarter the size of the object
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