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The refractive index of a material of a plano concave lens is $\large\frac{5}{3}$, the radius of curvature is $0.3\;m$. The focal length of the lens in air is
\[\begin {array} {1 1} (1)\;-0.45\;m & \quad (2)\;-0.6\;m \\ (3)\;-0.75\;m & \quad (4)\;-1.0\;m \end {array}\]
jeemain
eamcet
physics
2008
q103
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Oct 18, 2013
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meena.p
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(1) -0.45 m
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Nov 7, 2013
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pady_1
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