An object is placed at a distance of 4.5 cm to the left of a convex lens A of focal
length 4 cm.
(a) Find the distance from lens A where a screen should be placed to obtain the image.
(b) The screen is removed and the image is used as an object for a diverging lens B of
focal length 2 cm so that a real image is formed at a distance of 8 cm from lens B.
Find the distance between lens A and lens B.
a)
"f=\\frac{dF_A}{d-F_A}=36~cm,"
b)
"f'=\\frac{d'F_B}{d'+F_B}=1.6~cm,"
"l=f-f'=34.4~cm."
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