Two persons A and B wear glasses of optical powers (in air) `P_1 = + 2 D` and `P_2 = + 1D` respectively. The glasses have refractive index 1.5. Now they jump into a swimming pool and look at each other. B appears to be present at distance 2m (f rom A) to A. A appears to be present at distance 1m (from B) to B. The refractive index of water in the swimming pool, in the form `(X)/(10)` and find X.

Explanation

To solve the problem, we need to find the refractive index of water in the swimming pool, given the optical powers of glasses worn by two persons A and B, and the distances at which they appear to each other when submerged in water.

### Step-by-Step Solution:

1. **Identify the Given Data:**
- Optical power of A, \( P_1 = +2 \, D \)
- Optical power of B, \( P_2 = +1 \, D \)
- Refractive index of the glasses, \( n_{glass} = 1.5 \)
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