![]() ![]() (By convention, all angles in geometrical optics are measured with respect to the normal to the surfacethat is, to a line perpendicular to the surface.) The reflected ray is always in the plane defined by the incident ray and the normal to the surface. Repeat the experiment by varying the angle of incidence and recording the corresponding angle of reflection. The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray. Measure the angle of incidence and the angle of reflection.ħ. ![]() Remove the mirror and the ray box from the paper and join the crosses to track the incident ray and the reflected ray.Ħ. Mark the reflected ray with a cross on the paper using a pencil.ĥ. The light ray falls on the mirror and gets reflected. Using a pencil mark the path of the incident ray with a cross on the paper.Ĥ. Draw a line perpendicular to the reflecting surface of the mirror and mark it as the normal.Ģ. Place the light source (light ray box) away from the plane mirror, facing its reflecting surface as shown in the image.ģ. Shine the ray of light at the point where the normal meets the plane of the mirror. The experimental set up requires a light source (light ray box), a reflecting surface (plane mirror), a ruler, a protractor (to measure angles), an A4 size paper and marking pencils.ġ. Place the A4 paper on a leveled surface, draw a line along the long edge and fix a plane mirror upright on it. The angle of reflection is the angle created at the point of incidence between the normal and the reflected beam.The angle of reflection can be experimentally measured.The angle of deviation decreases as the angle of incidence rises, and when it reaches a point where the angle of incidence equals the angle of emergence, the angle of deviation is at its minimum, and it will begin to decrease again.The angle of incidence can be calculated by using Snell's Law. The speed of light is slowed inside the denser medium, but there is no resistance to the speed of light from any rarer medium. Denser mediums include glass, diamonds, and kerosene. The medium has a significant influence on the angle of incidence and refraction.Īir or any other type of gas is an example of a rarer medium. When compared to the speed of light in the denser medium, the rarer medium has a faster speed. The first is a more scarce medium, whereas the second is a denser medium. The ray of light makes contact with two different mediums. The angle of incident ray and angle of refracted ray ![]() Sunlight with a 90° incidence angle is absorbed, while light with a lower angle is reflected. The angle that is formed by a ray of sunlight colliding with a line perpendicular to a surface for example, a surface directly facing the sun has an angle of incidence of 0, whereas for a surface parallel to the sun (like rays of the sun striking a horizontal rooftop) has an angle of incidence as 90°.The angle of incidence is 0, the wavefront is parallel to the surface, and the path of the ray is perpendicular, or normal, to the contact in normal incidence. When a seismic wave collides with strata, it forms an acute angle.The angle of incidence = 900 - the angle the ray of light makes with the surface.Hence, the angle of incidence and reflection are always the same, and they are in the same plane as normal. The rule of reflection states that the angle of incidence equals the reflected angle. The ray of light that is reflected back after hitting the surface is known as the reflected ray.A line that is drawn perpendicular to the point of incidence is known as a normal.The incident ray hits the surface at a point known as point of incidence with a certain angle that is called the angle of incidence. ![]()
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