Three lenses L 1 , L 2 , L 3 are placed co-axially as shown in figure. Focal length's of lenses are given 30 cm , 10 cm and 5 cm respectively. If a parallel beam of light falling on lens L 1 , emerging L 3 as a convergent beam such that it converges at the focus of L 3 . Distance between L 1 and L 2 will be
A
40 cm 
B
30 cm
C
20 cm
D
10 cm
Text Solution
Verified by ExpertsThe correct answer is:
C
According to the problem, combination of 
and 
act a simple glass plate. Hence according to formula 
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