Coherent waves.
Answer:-
If two or more waves are in same phase or having a constant phase difference over a long distance and time then they are said to be coherent waves.
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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