When the mirrors are inclined at 90°, we get images

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

The law of reflection states that the angle of reflection is equal to the angle of

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?