Optics question
Level
2
find the position where image will be formed from 3rd lens(in cm)
distance b/w 1&2 is 5 cm
distance b/w 2&3 is 10cm
f1=10cm
f2=-10cm
f3=30cm
The answer is 30.
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1 solution
as the image formed from 1 lens is at 15 cm away from it,which is the focus of 2nd lens ,so it will form its image at infinity and for 3rd lens object is at infinity(as image from 2nd lens will acts is object for him) it will form its image at its focus,which is 30 away from it position hence answer is 30 cm