A concave mirror of curvature 40 cm, used for shaving purpose produces image of double size as that of the object. Object distance must be
A. 10 cm only
B. 20 cm only
C. 30 cm only
D. 10 cm or 30 cm
Answer:D
A concave mirror of curvature 40 cm, used for shaving purpose produces image of double size as that of the object. Object distance must be
A. 10 cm only B. 20 cm only C. 30 cm only D. 10 cm or 30 cm