Question

in which type of lens linear magnification is always less than 1

Answer 1

Magnification is Image height/ Object height.

Magnification less than one means that the image height is less than the object height. This is always true for a concave lens.

Answer 2

ANSWER:

The process of expanding or increasing the “actual size of an object” is called magnification.  

EXPLANATION:

When the magnification of the object is equal to 1, “it means that the image produced is equal to the same size of the object”. When the Exaggeration is greater than 1, the size of the image is larger than the original object and when the magnification lesser than 1, “the image size is reduced than the actual size of the object”. Hence the concave mirror Exaggeration is always less than one since it is the ratio of object distance to the image distance.