A) 41.48 cm
B) 20.25 cm
C) 15.3 cm
D) 2.8 cm
Correct Answer: A
Solution :
The focal length for red colour is \[{{f}_{R}}={{f}_{V}}=\frac{({{\mu }_{V}}-1)}{({{\mu }_{R}}-1)}\] Given, \[{{f}_{V}}=40\,cm,\,\,{{\mu }_{V}}=1.56,\,\,{{\mu }_{R}}=1.54\] \[\therefore \] \[{{f}_{R}}=40\times \frac{0.56}{0.54}=41.48\,cm\]You need to login to perform this action.
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