A) Is greater than zero but less than 1.5
B) Is greater than 1.5 but less than 2.0
C) Is greater than 1.0 but less than 1.5
D) None of these
Correct Answer: C
Solution :
[c] \[\frac{1}{f}=(\mu -1)\left( \frac{2}{R} \right)\] Or \[f=\frac{R}{2(\mu -1)}\] Now, \[f>R\] \[\therefore \frac{R}{2(\mu -1)}>R\] Or \[\frac{1}{2(\mu -1)}>1\] or \[2(\mu -1)<1\] Or \[\mu -1<\frac{1}{2}\] or \[\mu <\left( 1+\frac{1}{2} \right)\]or \[\mu <1.5\]You need to login to perform this action.
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