A concave mirror has a focal length 20 cm. The distance between the two positions of the object for which the image size is double of the object size is

A concave mirrorr has a focal length 20 cm. The distance between the two positions of the object for which the image size is double of the object size is

A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the image-size is double of the object-size.

An object is kept in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate the possible distance of the object from the mirror for a real image b. virtual image