Diffraction.
Answer:-
It is a phenomenon of light in which light is bends round the edges of the obstacles on which it is encounter and it is occur when the dimension of obstacles are comparable with wavelength of light.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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