Radius of curvature of concave mirror is 40cm and the size of image is twice as that of object, then the object distance is

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60 cm

20 cm

40 cm

30 cm

answer is D.

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Detailed Solution

f=R2=20cm,m=2 For real image; m=−2 By using m=ff−u, −2=−20−20−u⇒u=−30 cm For virtual image; m=+2 So, +2=−20−20−u⇒u=−10 cm

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