You can make eye contact with someone else through your mirror reflection because you know, subconsciously, that the law of reflection comes into play whenever you look at a mirror. It’s very similar to the woman’s image pictured above, and is a very good example of the law of reflection at work in real life. Since your eyes are pointed towards the mirror, how can you make eye contact with someone else? Well, quite simply, because it’s not you, but your mirror reflection that makes eye contact with the person to whom you are talking. You have probably been in the situation countless times when you’re looking at the mirror, but also talking to someone at the same time… while maintaining eye contact! How does that happen? The life and success of a tennis player becomes much easier if they are skilled in those particular predictions.ĭo you notice how the woman’s reflection is looking at the camera, but the lady herself isn’t? (Image Credit: freestockphotos) The reason the tennis example was appropriate is that it shows how important it is, in a game like tennis, to be able to predict how a projectile (i.e., the tennis ball) is going to behave. Light is diffused when it reflects from a rough surface. However, we’re not here to talk about tennis. A mirror has a smooth surface and reflects light at specific angles.
A mirror has a smooth surface and reflects light at specific angles. If you’re not good at tennis, then you might not be very good in this particular department. The angle of reflection equals the angle of incidence. If you are a tennis player, particularly a good one, you must be quite good at estimating the path that the ball will follow just by looking at the way it was hit by your opponent. It also states that the angle the incident ray makes with the normal is equal to the angle that the reflected ray makes with the normal. The law of reflection (in physics) states that when a light ray is incident on a plane surface, the incident ray, the reflected ray and the “normal” to the surface of the mirror all lie in the same plane. The angle of incidence is the angle at which the ray of light hits the surface, and the angle of reflection is the angle at which the ray of light reflects off the surface. The law of reflection is the principle that when a ray of light hits a surface, the ray of light will reflect off the surface at the same angle as it hit the surface. Angle of incidence and angle of reflection.If the mirror turns by an angle θ, the reflected ray turns through an angle 2θ.The smallest size of the mirror required to see the total image of the object is half the size of the object.Image shaped by a plane mirror is as far behind the mirror as the object is in front of it and it is always virtual.The only way we can see an object that does not itself emit light is if that object reflects light. This is when a light ray, the incident ray, hits a reflective material and bounces off as the reflected ray at a specific angle. If an object is positioned between two plane mirrors disposed at an angle θ, then the number of images formed is n = (360º/θ) – 1.Ĭharacteristics of the Image Formed by a Plane Mirror When light is bounced off of a material, such as a mirror, this is called a reflection. The reflected ray has thus been rotated through an angle BOP when the mirror is rotated through an angle θ.įor the same incident ray, when the mirror is rotated through an angle, the reflected ray is rotated through twice the angle. Hence the new angle of deviation COP = 2 (α + θ). Here the glancing angle with X’Y’ is (α + O). The same incident ray AO is now reflected along OP.
Suppose the mirror is rotated through an angle O to a position X’Y’. We know that the angle of deviation COB = 2α. Let α be the glancing angle with XY (Figure). Before the mirror has rotated, the angle of incidence is θ as is the angle of reflection.ĭeviation of Light due to Rotation of a Mirror: Let consider al ray of light AO incident on a plane mirror XY at O.
Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle θ. The arrowhead indicates the path of light. They travel along the straight line in a similar homogeneous medium and are represented by straight lines with arrowheads. A ray of light is the path along which the lights travel.
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