Light can be blocked by using a cardboard or other obstacle while sound wave cannot be blocked in similar way. Exaplain.

Explanation

### Step-by-Step Solution:

1. **Understanding Light and Sound Waves**:
- Light waves are electromagnetic waves that travel in straight lines and exhibit rectilinear propagation. Sound waves, on the other hand, are mechanical waves that require a medium to propagate and can bend around obstacles.

2. **Rectilinear Propagation of Light**:
- Light travels in straight lines unless it encounters an obstacle. If the obstacle is small compared to the wavelength of light, diffraction occurs, causing the light to bend around the edges of the obstacle.

...