A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at
A. 25 cm
B. 40 cm
C. 10 cm
D. At infinity
Answer:C
A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at
A. 25 cm B. 40 cm C. 10 cm D. At infinity