Can light be bent?

Diffraction is a property of waves. Therefore light will always bend around corners. The reason you can’t see behind a wall when you can hear a sound behind the wall is because the wave length of light is so much smaller than that of sound.

The amount of diffraction depends heavily on the wavelength. The smaller the wavelength, the less it will ‘bend’ around a corner. And the bigger the wavelength, the more it will bend. Radio waves for example, have VERY large wavelengths, which is why your radio works inside the car or a building. To stop or prevent a wave from diffracting, you need an obstacle that is at least as big as the wavelength of the wave.