A) 37.3 cm
B) 46.0 cm
C) 50.0 cm
D) 54.0 cm
Correct Answer: D
Solution :
Using lens formula for objective lens \[\frac{1}{{{v}_{0}}}-\frac{1}{{{u}_{0}}}=\frac{1}{{{f}_{0}}}\Rightarrow \frac{1}{{{v}_{0}}}=\frac{1}{{{f}_{0}}}+\frac{1}{{{u}_{0}}}\] \[\Rightarrow \] \[\frac{1}{{{v}_{0}}}=\frac{1}{40}+\frac{1}{-200}=\frac{+5-1}{200}\] \[\Rightarrow \]\[{{v}_{0}}=50\,cm\] Tube length \[\ell =\,|{{v}_{0}}|+{{f}_{e}}=50+4=54\,cm.\]You need to login to perform this action.
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