An ink dot appeared to be raised by 1 cm when covered with a glass slab of thickness t cm. Calculate the value of t if the velocity of light in air and glass is `3 xx 10^(8) m//s` and `2 xx 10^(8) m//s`, respectively.

Explanation

To solve the problem, we need to calculate the thickness \( t \) of the glass slab given that an ink dot appears to be raised by 1 cm when covered with the slab. We will use the concept of apparent depth and real depth in optics.

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Velocity of light in air, \( v_{\text{air}} = 3 \times 10^8 \, \text{m/s} \)
- Velocity of light in glass, \( v_{\text{glass}} = 2 \times 10^8 \, \text{m/s} \)
- The apparent rise of the ink dot, \( h = 1 \, \text{cm} \)
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