Question

Каков угол падения луча при переходе из воздуха в воду если синус углапреломления 0.39 а показатель преломления воды относительно воздуха 1.3

Answer 1

N1*sin(α1) = n2* sin(α2)
так как коэффициент преломления в воздухе =1. то синус искомого угла будет равен:
sin (α1)=0,39*1,3=0,507
α1≈ 30 градусов

Answer 2

Angle of Incidence when Light Transitions from Air to Water

When light travels from one medium to another, such as from air to water, it undergoes refraction. Refraction is the bending of light as it passes through different substances with different optical densities. The angle of incidence is the angle between the incident ray (the incoming light ray) and the normal (a line perpendicular to the surface of the medium).

To calculate the angle of incidence when light transitions from air to water, we can use Snell's law, which relates the angles of incidence and refraction to the refractive indices of the two media involved.

The refractive index of a medium is a measure of how much the speed of light is reduced when it passes through that medium compared to its speed in a vacuum. The refractive index of air is very close to 1, while the refractive index of water is approximately 1.33.

Given that the sine of the angle of refraction is 0.39 and the refractive index of water relative to air is 1.3, we can calculate the angle of incidence using Snell's law:

Snell's Law: n1 * sin(θ1) = n2 * sin(θ2)

Where: - n1 is the refractive index of the first medium (air) - θ1 is the angle of incidence - n2 is the refractive index of the second medium (water) - θ2 is the angle of refraction

In this case, we know that n1 is approximately 1, n2 is 1.33, and sin(θ2) is 0.39. We can rearrange Snell's law to solve for θ1:

θ1 = arcsin((n2 / n1) * sin(θ2))

Substituting the values, we get:

θ1 = arcsin((1.33 / 1) * 0.39)

Calculating this expression, we find that the angle of incidence when light transitions from air to water is approximately 24.9 degrees.

Please note that the above calculation assumes that the light is passing from air into water. If the light were passing from water into air, the angle of incidence would be different.