Define M.P. of simple microscope and M.P. ‘of telescope.
Answers
The magnifying power is the extent to which the object being viewed appears enlarged. In other words, it measures how much larger an object appears after magnification/enlargement.
M.P. of a Simple Microscope:
Magnifying Power (M) of a simple microscope (or a simple magnifying lens) is calculated by dividing the ‘least distance of distinct vision’ (LDVV) by the ‘focal length’ (f) of the lens.
M = LDVV / f (cm)
The LDVV of a person is found by taking a reading material closer to their naked eye (without spectacles or contacts) until it becomes blurry. This distance between their eye and the reading material is ones LDDV. The average LDDV of a person with healthy eye-sight is found to be 25cm.
‘f’ is the distance from the lens to the plane at which the incoming light is focused.
Hence, magnifying power of a simple microscope, M = 25 / f (cm)
M.P. of a Telescope:
Magnifying Power of a telescope is calculated by dividing focal length of the lens with the eyepiece diameter (D).
M = f/D (cm)
‘D’ is nothing but the focal length of the eyepiece which is measured in a similar way as that of ‘f’.