[填空题]
Two converging lenses, one +d q3 k;co 8rcv9ma(agwit1wn 1 io10+fpbeqlqy 7h $f=4.0\mathrm{~cm}$ and the other with $f=44\mathrm{~cm}$ are made into a telescope.
(a) What are the length and magnification? Which lens should be the eyepiece?
The distance between the two lenses is cm
M = $\times $
f = cm
(b) Assume these lenses are now combined to make a microscope; if the magnification needs to be $25\times,$ how long would the microscope be? cm
