A drop of water appears like pear due to:

Options

A. refraction
B. reflection
C. total internal reflection
D. none of these

Explanation

To answer the question, "A drop of water appears like a pearl due to:", we can break down the explanation into a step-by-step solution.

### Step-by-Step Solution:

1. **Understanding the Shape of the Drop**:
- A drop of water is generally spherical in shape due to surface tension. This spherical shape plays a crucial role in how light interacts with it.

**Hint**: Consider how surface tension affects the shape of liquids.

2. **Light Refraction**:
- When light rays enter the water drop, they bend towards the normal due to the higher refractive index of water compared to air. This bending of light is known as refraction.

**Hint**: Recall the concept of refraction and how light behaves when it passes from one medium to another.

3. **Total Internal Reflection**:
- As light travels through the drop, it can hit the inner surface of the drop. If the angle of incidence is greater than the critical angle, the light will not exit the drop but will instead reflect back into the water. This phenomenon is known as total internal reflection.

**Hint**: Think about the conditions required for total internal reflection to occur.

4. **Multiple Reflections**:
- The light can reflect multiple times within the drop before it eventually exits. Each reflection and refraction contributes to the overall appearance of the drop.

**Hint**: Visualize how light bounces around inside the drop before escaping.

5. **Appearance Like a Pearl**:
- The combination of refraction and total internal reflection creates a beautiful play of light, making the drop of water appear shiny and lustrous, similar to a pearl.

**Hint**: Consider how the interaction of light with surfaces can create visual effects.

### Conclusion:
The drop of water appears like a pearl primarily due to the phenomenon of **total internal reflection** combined with refraction, which enhances its shiny appearance.