Theory > Physics > 2016 > PAPER II > PART II > 10 > e > ii
WASSCE
An illuminated object is placed at a distance of 75cm from a converging lens of focal length 30cm.
If the lens is replaced by another converging lens, the object has to be moved 25 cm further away to have its sharp image on the screen.
Determine the focal length of the second lens
If the lens is replaced by another converging lens, the object has to be moved 25 cm further away to have its sharp image on the screen.
Determine the focal length of the second lens
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