To observe diffraction, the size of the obstacle

Assertion: To observe diffraction of light the size of obstacle/aperture should be of the order of 10^-7m . Reason: 10^-7m is the order of wavelength of visible light.

Assertion: To observe diffraction of light the size of obstacle/aperture should be of the order of 10^-7m . Reason: 10^-7m is the order of wavelength of visible light.

Statement I : To observe diffraction of light, the size of obstacle or aperture should be of the order of 10^(-7) m. Statement II : 10^(-7) m is the order of wavelength of visible light.

The correct relation between the size of the obstacle and wavelength of light in order to observe thde diffraction event is

Explain why (or how): Bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”,