Retarders.
Answer:-
A retarder is a uniform plate of birefringent material whose optic axis lies in the plane of the plate.Retarders are called quarter-wave plates, half-wave plates and full-wave plates depending on their action.
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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