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What is the focal length if plane surfac...

What is the focal length if plane surface is silvered in previous illustration.

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To find the focal length when a plane surface of a lens is silvered (acting as a mirror), we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the System**: - We start with a lens that has one plane surface. When this surface is silvered, it behaves like a combination of a lens and a mirror. 2. **Focal Length of the Lens**: ...
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