Question

an erect image formed by a spherical mirror is half the size of object and formed at a distance of 10 cm behind it...find where the screen should be placed to obtain magnification of 1/3 of size of object



plz its my humble request that any of you plz answer this question
it's for 45 points
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Answer 1

Answer:

ANSWER

Since the image is erect , so the magnification ratio must be positive .

m=2

also u=−10cm

so m=−

u

v

2=−

−10

v

v=20cm

So the image is virtual and 20 cm from mirror on the other side of the object