A concave mirror with its optic axis vertical and mirror facinig upward is placed at the bottom of the water tank. The radius of curvature of the mirror is 40 cm and refractive index for water `mu=4//3` . The tank is 20 cm deep and if a bird is flying over the tank at a height of 60 cm above the surface of water, find the position of image of the bird.

Explanation

To solve the problem step by step, we will follow the sequence of events as described in the video transcript, ensuring clarity and thoroughness in each step.

### Step 1: Understanding the Setup
- We have a concave mirror placed at the bottom of a water tank.
- The radius of curvature of the mirror (R) is 40 cm, which gives us the focal length (F) as:
\[ F = \frac{R}{2} = \frac{40 \, \text{cm}}{2} = 20 \, \text{cm} \]
...