Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination isPhysics A. zero B. focus C. 2 f D. f/2
Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?
The most fundamental of all sciences which provides basic principles and fundamental laws to other branches of science is
