A) \[400\,\,cm\]
B) \[200\,\,cm\]
C) \[100\,\,cm\]
D) \[50\,\,cm\]
Correct Answer: C
Solution :
Refractive index\[\mu =1.6\] Radius of curved surface\[{{R}_{1}}=60\] Radius of plane surface\[{{R}_{2}}=\infty \] The relation for focal length\[n\] \[\frac{1}{f}=(\mu -1)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] \[=(1.6-1)\left( \frac{1}{60}-\frac{1}{\infty } \right)\] \[=0.6\times \frac{1}{60}=0.01\] or \[f=\frac{1}{0.01}=100\,\,cm\]You need to login to perform this action.
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