Reflection & Refraction of Light PDF

MAGANDA NG LOOP Which soldier is taller? Are the purple lines straight or do they appear bent? Is the center circle bigger than the center on the right? How many colors are there? OPTICAL ILLUSION Get a plane mirror, look at the mirror and examine your image. Process Questions: 1. What can...

MAGANDA NG LOOP Which soldier is taller? Are the purple lines straight or do they appear bent? Is the center circle bigger than the center on the right? How many colors are there? OPTICAL ILLUSION Get a plane mirror, look at the mirror and examine your image. Process Questions: 1. What can you say about the size of your image? Is it the same with your actual size? 2. How about the distance of your image from the mirror? Is it the same with your distance from the mirror? 3. Raise your right hand. What happened to your image in the mirror? 4. Do you know that the images formed by plane mirrors are virtual images? LIGHT WAVES Reflection and Refraction of Light Reflection Reflection of Light Light waves bounce off from a reflecting surface and this property is called reflection. A highly polished surface, such Two Types of Reflection Reflection of Light Specular reflection occurs when the reflective surface is very smooth such as a mirror or a surface of calm water. Reflection of Light Diffuse reflection is observed when a light hits a rough surface resulting to the bouncing back of light waves in different Reflection of Light For instance, a smooth reflecting surface that produces specular reflection of red rays may produce diffuse reflection when incident upon by violet rays. This dispersal of reflected Reflection of Light Although diffused light gives us irregular images, this phenomenon is also beneficial as it allows us to regulate the Reflection of Light Absorption is the transfer of energy carried by the light waves to the particles of matter. Scattering is the reflection of light by particles Reflection of Light When you shine a penlight in the air, some of the energy from the light is absorbed by the air particle; thus, there is a dimming effect in the room. When the light is released, light is scattered in all  Laws of Reflection of Light Laws of Reflection of Light  (1) The angle of incidence is equal to the angle of reflection (2) The incident ray, the normal to the mirror at the point of incidence, and the Laws of Reflection of Light  (1) The angle of incidence is equal to the angle of reflection. Laws of Reflection of Light (2) The incident ray, the normal to the mirror at the point of incidence, and the reflected ray all lie in the same plane. Refraction Refraction of Light Refraction is the bending of light as it passes from one medium to another. Refraction of Light Refraction is the bending of light as it passes from one medium to another. Refraction of Light Dispersion is the effect associated with the separation of light into colors by a prism. As the light enters the Index of Refraction As light refracts, the velocity of the wave is altered, its wavelength increases or decreases, but its frequency remains constant. The speed of light varies in different substances. The speed of light in vacuum is usually denoted by c, for "constant" or the Latin celeritas (meaning Index of Refraction The Systeme Internationale defines the meter as the distance light travels in vacuum in 1/299,792,458 of a second. This definition fixes the speed of light in vacuum at exactly 299, 792, Index of Refraction In water, light travels at 2.25x10 ^ 8m/s, while its speed in crown glass decreases to 2.0x10^8m/s. The ratio of velocities of light from a vacuum into another medium is the index of refraction, n, for that other medium and remains the same whatever angle of the incident ray upon the refracting surface. The index of refraction, n, can be computed using the equation: n = c/v Index of Refraction Index of Refraction As an incident ray passes through different media, the resulting rays bend. Two angles are formed in this phenomenon and these angles are called angle of incidence and angle Index of Refraction Contrary to reflected rays, the rays forming these angles occur in different planes. The angle of refraction increases as the angle of incidence increases. When the angle of incidence produces an angle of refraction that is equal to 90° in the medium, the angle is known as critical angle. Total internal reflection is the phenomenon wherein the Incident rays striking the boundary of two media are reflected Index of Refraction The following are the laws of refraction of light: (1) The incident ray, the refracted ray, and the normal to the interface of two transparent media at the point of incidence all lie in the same plane. (ii) The ratio of sine of angle of incidence to the sine of angle of THANK YOU!