✌In the current experiment, the initial beam hits perpendicularly to the air-glass boundary, thus refraction at the entrance is absent.

 In the current experiment, the direction of the initial beam of light is perpendicular to the air-glass boundary. This means that there is no refraction at the entrance of the glass, and the light continues to travel in a straight line without changing direction. Refraction occurs when light passes through a medium with a different refractive index, causing it to bend or change direction. However, in this case, since the initial beam of light is perpendicular to the surface of the glass, there is no change in direction, and the light continues to travel straight through the glass. This is an important consideration in the experiment, as it helps to ensure that the results are accurate and reliable.

When light passes through a boundary between two mediums with different refractive indices, it changes direction. This phenomenon is known as refraction. In the current experiment, the initial beam hits perpendicularly to the air-glass boundary, which means that refraction at the entrance is absent.

Refraction occurs when the speed of light changes as it moves from one medium to another. The speed of light in a vacuum is approximately 299,792,458 meters per second. However, when light enters a medium such as glass or water, its speed decreases. The amount by which the speed of light decreases depends on the refractive index of the medium. The refractive index is a measure of how much a material can bend light.

When light enters a medium at an angle, it changes direction. This change in direction is known as refraction. The amount by which the light bends depends on the angle of incidence and the refractive index of the medium. When the angle of incidence is zero, the light enters the medium perpendicularly, and there is no refraction. This is the case in the current experiment where the initial beam hits perpendicularly to the air-glass boundary, and thus refraction at the entrance is absent.

In this experiment, we are interested in studying the behavior of light as it passes through a glass slab. The glass slab has two parallel surfaces, and we shine a beam of light on one of the surfaces. We then observe the path of the light as it passes through the slab and emerges from the other side.

There are a few questions that arise from this experiment. Firstly, what happens to the beam of light as it passes through the glass slab? Does it change direction, and if so, by how much? Secondly, how does the thickness of the glass slab affect the path of the light? Finally, what is the relationship between the angle of incidence and the angle of refraction?

To answer these questions, we set up the experiment as follows. We place a glass slab on a flat surface and shine a beam of light on one of the surfaces of the slab. We then observe the path of the light as it passes through the slab and emerges from the other side. We use a protractor to measure the angle of incidence and the angle of refraction.

We repeat the experiment for different thicknesses of the glass slab and record the angle of incidence and the angle of refraction for each thickness. We then plot a graph of the angle of incidence against the angle of refraction for each thickness. From the graph, we can see the relationship between the angle of incidence and the angle of refraction.

From our experiment, we find that the beam of light changes direction as it passes through the glass slab. This is because the refractive index of glass is greater than the refractive index of air. The amount by which the light changes direction depends on the angle of incidence and the refractive index of glass. We find that the thicker the glass slab, the more the light is bent.

We also find that there is a relationship between the angle of incidence and the angle of refraction. This relationship is known as Snell's law. Snell's law states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media. This can be expressed mathematically as follows:

sin i / sin r = n1 / n2

where i is the angle of incidence, r is the angle of refraction, n1 is the refractive index of the first medium (in this case air), and n2 is the refractive index of the second medium (in this case glass).

In conclusion, the current experiment shows that refraction occurs when light passes