# Q10.17 (d) Answer the following questions:Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily.

P Pankaj Sanodiya

The size of obstacle should be comparable to the wavelength for diffraction of waves by obstacles, through a large scale.

This comes from

$sin\theta =\frac{\lambda}{a}$

$sin\theta =\frac{10^{-7}}{10}=10^{-8}$

This implies $\theta\rightarrow 0$

it means the light goes almost unbent and hence student are unable to see each other.

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