Marginal rays.
Answer:-
Rays which are passing through a lens farther away from the axis are refracted more and come to focus closer to the lens are called marginal or peripheral rays.
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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