One end of a cylindrical glass rod `(mu = 1.5)` is given the shape of a concave refracting surface of radius 10cm. An air bubble is situated in the glass rod at a point on its axis such that it appears to be at distance 10 cm from the surface and inside glass when seen from the other medium. Find the actual location of air bubble.

Explanation

To solve the problem, we need to find the actual location of the air bubble inside the cylindrical glass rod with a concave refracting surface. We will use the lens maker's formula for this calculation.

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Refractive index of glass (μ2) = 1.5
- Refractive index of air (μ1) = 1.0
- Radius of curvature (R) = 10 cm (since it is concave, we take R as negative, so R = -10 cm)
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