The focal length of a concave mirror is 50 cm. To obtain an inverted image two times the size of the object the object should be placed at

Q. The focal length of a concave mirror is 50 cm. To obtain an inverted image two times the size of the object the object should be placed at :

A)           50 cm

B)            63 cm

C)            72 cm

D)           75 cm

 Answer: 75 cm