39), but the viewing is more comfortable and the difference
in magnification is usually small In subsequent discussions of optical
instruments (microscope and telescope) we shall assume the image to be
at infinity Rationalised 2023-24
Ray Optics and
Optical Instruments
243
A simple microscope has a limited maximum magnification (£ 9) for
realistic focal lengths For much larger magnifications, one uses two lenses,
one compounding the effect of the other