Question: How far from a convex mirror must a pencil be held to form an image of half: 1 pencil size? the radius of the mirror

How far from a convex mirror must a pencil be held to form an image of half: 1 pencil size? the radius of the mirror is 40 cm. 

a: 20 cm

b: 70 cm

c. 30 cm

d. None of above

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