Longitudinal magnification.
Answer:-
Longitudinal magnification, of a mirror, is defined as the size of the image to the size of object both measured along the direction of principal axis.
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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