Question

A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36cm. The distance of the object from the mirror is –

• A. 5cm
• B. 12cm
• C. 10cm
• D. 20cm

Answer 1

Answer: (B)

12cm

Answer 2

Image is virtual so m = + 3 ̃ f = = 18cm

so m = $\frac { ( - 18 ) } { - 18 - u }$ ̃ u = – 12cm