A small air bubble in a sphere of glass with radius 4 cm appears to be 1 cm from the surface when observed along a diameter. Find the true positino of the air bubble.

Explanation

To solve the problem of finding the true position of the air bubble in a glass sphere, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**:
- We have a glass sphere with a radius of 4 cm.
- An air bubble inside the sphere appears to be 1 cm from the surface when viewed along a diameter.

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