D is the best answer. In many physics problems we treat an extended object as if it were a point with the same mass located at the center of mass.
The point of contact the path difference is zero but one of the interfering ray is reflected so the effective path difference becomes λ/2 thus the condition of minimum intensity is created in the center.
Work = (force) x (distance) =
(200 N) x (3.5 m) = <em>700 joules</em>
Answer:
A lens placed in a transparent liquid becomes invisible because when refractive index of the material of the lens is equal to the refractive index of the liquid in which lens is placed under this condition no bending of light takes place when it travels from liquid to the lens, so both will start behaving like both are same things.
Explanation:
hope it helps :))
