A convex and a concave lens separated by distance are then put in contact. The focal length of the combination |
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a) |
Decreases |
b) |
Increases |
c) |
Becomes zero |
d) |
Remains the same |

A convex and a concave lens separated by distance are then put in contact. The focal length of the combination |
|||||||

a) |
Decreases |
b) |
Increases |
c) |
Becomes zero |
d) |
Remains the same |

1 Answer

127 votes

When two lenses are placed coaxially at a distance from each other, then equivalent focal length (F) is given by When the lenses are put together, Hence, the focal length of the combination will decrease. |

127 votes

127