A lens of focal power is |
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a) |
A convex lens of focal length |
b) |
A concave lens of focal length |

c) |
A convex lens of focal length |
d) |
A concave lens of focal length |

A lens of focal power is |
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a) |
A convex lens of focal length |
b) |
A concave lens of focal length |

c) |
A convex lens of focal length |
d) |
A concave lens of focal length |

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