you are given three lenses L1, L2 ,L3 each of focal length 10 cm.An object is kept at 15 cm in front of L1 . The final real image is formed at the focus 'I' of L3 .Find the seperations between L1 , L2 and L3
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For L1
u= -15, f=10
so v=30cm
ForL3
v=10and f= 10
so u=infinity
for L2 , v =infinity , f = 10 cm
so u= - 10cm
separation between L1 and L2 is 30 + 10 =40 cm
separation between L2 and L3 cannot be determined .
u= -15, f=10
so v=30cm
ForL3
v=10and f= 10
so u=infinity
for L2 , v =infinity , f = 10 cm
so u= - 10cm
separation between L1 and L2 is 30 + 10 =40 cm
separation between L2 and L3 cannot be determined .
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