An object of length 6 cm is placed on the principle axis of a concave mirror of focal length f at a distance of 4 f. The length of the image will be
The object distance u=−6cm
Now, magnification is
Hence, the length of image is -2 cm
At what distance from a concave mirror of focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall ?