Assume that in the second harmonic generation (shg) crystal the difference between the index of refraction at fundamental frequency nw1 (l=1.064 mm) and at the second harmonic frequency nw2 is equal to 10-4.
what is the optimal length of the second harmonic crystal [cm]?

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft