MCQOPTIONS
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MCQOPTIONS
| 1. |
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is [MP PET 2002] |
| A. | \[\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}\] |
| B. | \[\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}\] |
| C. | \[\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}\] |
| D. | \[\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}\] |
| Answer» C. \[\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}\] | |