4.To measure the focal length of a diverging lens, a converging lens is placed in contact with it as shown to the right. The sun's are focused by this rays combination at a point 28.5 cm behind the lenses. If the converging lens has a focal length fc of 16 cm, what is the focal length of the diverging lens?
4.To measure the focal length of a diverging lens, a converging lens is placed in contact with it as shown to the right. The sun's are focused by this rays combination at a point 28.5 cm behind the lenses. If the converging lens has a focal length fc of 16 cm, what is the focal length of the diverging lens?
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Transcribed Image Text:4.To measure the focal length of
a diverging lens, a converging
lens is placed in contact with it
as shown to the right. The sun's
focused by this
Image point
made by first lens
(object point
for second lens)
are
rays
combination at a point 28.5 cm
behind
Image made by
second lens
the lenses. If the
converging lens has a focal
length fc of 16 cm, what is the
focal length of the diverging
lens?
(final image)
fc
-fr =28.5 cm
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