Question

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?​

Answer 1

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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Answer 2

Answer:

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