The plane face of a planoconvex lens is silvered. If be the refractive index and the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature |
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a) |
b) |
c) |
d) |

The plane face of a planoconvex lens is silvered. If be the refractive index and the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature |
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a) |
b) |
c) |
d) |

1 Answer

127 votes

When an object is placed in front of such a lens, the rays are first of all refracted from the convex surface and again refracted from convex surface. Let be focal lengths of convex surface and mirror (plane polished surface) respectively, then effective focal length is Since, From lens formula |

127 votes

127