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Physics 07
Basically, for the past few lessons, we've learning reflection and refraction.What about reflection? Objects can be seen by the light they emit, or, more often, by the light they reflect. Reflected light obeys the law of reflection, that the angle of reflection equals the angle of incidence.  The light ray that emits from an object is called the incident ray. While the reflected image from a surface is called the reflected ray. There is a normal, which is perpendicular to the surface. Take note that the angle of the incident ray is = to the angle of reflected ray. Most objects exhibit diffuse reflection, with light being reflected in all directions. All objects obey the law of reflection on a microscopic level, but if the irregularities on the surface of an object are larger than the wavelength of light, which is usually the case, the light reflects off in all directions. PLANE MIRRORS: A plane mirror is simply a mirror with a flat surface; all of us use plane mirrors every day, so we've got plenty of experience with them. These are the properties of the reflected image: 1) The image is upright 2) The image is laterally inverted 3) The object from the mirror, is = to the mirror from the object in the mirror. 4) The image is virtual 5) The image will be the same size, colour etc  ------------------------------------------------------------------------------------------------------------ Apart from plane mirrors, we also have concave and convex mirrors. What are concave mirrors then? Basically, concave mirrors are mirrors that bend inwards.  Hence, the mirror image will appear larger than it actually is. How about convex mirrors? Convex mirrors are mirrors that bend outwards.  Which means, it can reflect image from a larger distance into our eyes. Hence, it's use commonly as blind spot mirrors. |