Two forces pull on an object at the same time. their resultant force is least when the angle between the forces is a. 0° b. 45° c. 90° d. 180°

Two forces pull on an object at the same time. Their resultant force is least when the angle between the forces is 180°.

Option D

Explanation:

When two forces are acting on an object, two possibilities are there.

(i) Forces acting on the same direction.

(ii) Forces acting o the opposite direction.

When two forces are acting on the same direction, their resultant force will be maximum, but when they are acting on the opposite direction, minimum resultant force will be the outcome (i.e) they are 180 degrees apart.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.