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Grade: 10
`        The plane face of a plane convex of focal length 20cm is soldered.the lens will then behave as a concave mirror of focal length? `
2 years ago

## Answers : (1)

Arun
24739 Points
```							Since net power of a silvered lens is          71​  = f lens​  −2​  + f mirror​  1​  hence according to question          71​  = 20−2​  = 201​  = 20−1​                f=−20cm​
```
2 months ago
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