Help me to complete the given ray diagram ​

a)  θ₁ = 48.6º angle of incidence must be greater than this value for the ray to be reflected

b) θ₁ = 49.8º, the angle of incidence is greater than this value, the ray is reflected.

Explanation:

When a ray of light passes from one medium to another it must comply with the law of refraction, in the case of the incident medium it has a refractive index greater than the medium to which it must transmit, total internal reflection can occur

               n₁ sin θ₁ = n₂ sin θ₂

where we use subscript 1 for the incident medium and subscript 2 for the refracted medium.

In the case of θ₂ = 90, the sin 90 = 1, internal total reflection occurs.

              sin θ₁ = n₂ / n₁

the medium where it is transmitted is air with n₂ = 1

in the first diagram the incident medium is water with n₁ = 1,333

let's calculate the angle of incidence for the total internal reflection to occur

              sin θ₁ = 1 / 1,333

              θ₁ = sin⁻¹ 0.7502

              θ₁ = 48.6º

the angle of incidence must be greater than this value for the ray to be reflected

second case the refractive index of ice is n₁ = 1.309

            sin θ₁ = 1 / 1.309

            θ₁ = sin⁻¹  0.7639

            θ₁ = 49.8º

as the angle of incidence is greater than this value, the ray is reflected.

volts times amps 6 x 0.5 3w

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.