In above question if observer is in medium `mu_(3)` what is the apparenet depth of object seen below surface 1CD`.

Explanation

To find the apparent depth of an object seen below the surface CD when the observer is in medium with refractive index \( \mu_3 \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Mediums and Their Refractive Indices**:
- Let the refractive index of the medium above surface CD be \( \mu_1 \).
- The refractive index of the medium below surface CD (where the object is located) is \( \mu_2 \).
- The refractive index of the medium where the observer is located is \( \mu_3 \).
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