Question

What must be must be the object distance for a concave mirror of focal length 20 cm to produce an erect image

Answer 1

Answer:

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Explanation:

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