The relation between the angle of incidence and the angle of refraction is known as Snell's Law. Since the light travels with different speed in different media, the direction of the ray of light will change when it crosses the boundary between the two media
Newton's principle
newton's 2nd law of motion where F=ma
Answer:
Part a)

Part b)

Explanation:
Part a)
mass of the Falcon bird is given as

initial speed of the bird is

final speed of the bird is given as
(opposite direction)
So here the impulse given by falcon bird is given as



now the final momentum of Raven bird in perpendicular direction is given as



now the change in the angle of the raven bird is given as



Part b)
Final speed of the raven bird is given as


