# Reflection and refraction

The Doppler Effect Previously in Lesson 3the behavior of waves traveling along a rope from a more dense medium to a less dense medium and vice versa was discussed. In plane mirrors, we use the laws of reflection while drawing the image of the objects. As you see from the picture we send rays from the top and bottom of the object to the mirror and reflect them with the same angle it hits the mirror.

The extensions of the reflected rays give us the image of our object. The orientation and height of the image is same as the object. In plane mirrors always virtual image is formed.

Moving Plane Mirror If the mirror moves with a velocity of V then image of the object moves with the velocity of 2V with the same direction of mirror. If the object moves with a velocity of V then image also moves with same speed but opposite in direction.

Pictures given below shows the motion of object and image. Curved Mirrors We call these types of mirrors also spherical mirrors because they are pieces of a sphere. If the reflecting surface of the mirror is outside of the sphere then we call it convex mirror and if the reflecting surface of it is inside the sphere then we call it concave mirror.

As you can understand from the name it is the center of the sphere which the mirror is taken from. It is denoted by C in the diagrams. Line coming from the center of the sphere to the mirror is called as principal axis. It is the intersection point of the mirror and principal axis. We show it with the letter V in ray diagrams.

For concave mirrors and thin lenses rays coming parallel to the principal axis reflects from the optical device and pass from this point. For convex mirrors and thick lenses rays coming from this point or appear to coming from this point reflect parallel to the principal axis from the optical device.

Another explanation for this term is that, it is the point where the image of the object at infinity is formed. It is denoted with the letter F or sometimes f in ray diagrams. It is the distance between center of the sphere and vertex. We show it with R in ray diagrams.

Mirror Equations of Curved Mirrors Refraction When light passes from one medium to another medium velocity of it changes and so, its direction changes.

## Refraction, Snell's law, and total internal reflection

We call this change in the direction of light refraction. Refractive Index It is the ratio of the speed of light in vacuum to the speed of the light in given medium.

Refractive index of medium A is given below.In physics refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.

Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation. The results of this experiment are pretty surprising. Kids (and adults) will stare in amazement and scratch their heads wondering what caused the arrow to change direction.

Do you know why?

## Supplies Needed

Leave a comment below to submit your guess. Light Refraction Science Experiment Video Light Refraction Science Experiment Supplies Needed Piece of Paper Marker Glass Water Experiment. LIGHT – REFLECTION AND REFRACTION 81 9. Magnification produced by a rear view mirror fitted in vehicles (a) is less than one (b) is more than one (c) is equal to one (d) can be more than or less than one depending upon the position.

1. A ray of light travels in a a. circle. b.

 Light Refraction Reflection and refraction Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. Difference Between Reflection and Refraction | Difference Between Mirrors Video transcript In this video we're going to try to learn a little bit about reflection. Or I guess you could say we are going to reflect on reflection. Latest Illustrations Refraction, Snell's law, and total internal reflection Relevant sections in the book:

straight-line. c.

## IP, What affects light reflection?- refraction and diffraction of light?

right-angle. d. none of the above. 2. Visible electromagnetic radiation is called a. light. b. a ray. Rayfract seismic refraction and borehole tomography software provides subsurface seismic velocity models for geotechnical engineering and exploration. Refraction of Waves. Reflection involves a change in direction of waves when they bounce off a barrier.

Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.

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