hey guys i have two questions that i wouldn't mind some help on ! firstly a wave in the form (in meters) of y = 0.5sin(4(pi)t+0.5(pi)x) where t and x are time and space co-ordinates in seconds and meters find the wave length amplitude frequency and speed of the wave. is the wave traveling in the +x or -x direction? and a hand glider is flying at an altitude of h=125m, green light of wavelength 555nm enters the pilots eye through a pupil that has a diameter D = 2.5mm. the average index of refraction of the material in the eye is n = 1.36. Determine how far aprt two point objects must be on the ground if the pilot is to have any hope of distinguishing them. any help will be great! thanks in advance!