# What is the composition of a translation and a reflection across a line parallel to the direction of translation?

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### What is the difference between regular and diffuse reflection?

regularreflection: 1. Reflection from a polished surface is called regular reflection. 2. The rays are parallel. 3. Give glaze to our eyes. 4. Example, plain mirror. Diffused Reflection: 1. Reflection from a rough surface is called diffuse reflection. 2. The rays are not parallel. 3. It makes objects visible. 4. Example, wall.

### In what way does the law of reflection hold for curved mirrors?

The law of reflection is exactly the same for curved mirrors as for plane (flat) mirrors i.e. 'The angle of reflection equals the angle of incidence' On a plane mirror normal lines would all be drawn parallel to each other, which means that parallel rays of light would be reflected parallel to each other. On a curved mirror the normal lines would not be parallel to each other, so parallel rays of light hitting the…

### Why does a reflection not preserve orientation of a figure on the plane?

Because a reflection reverses the direction of the component of the wave vector of the light hitting the reflecting surface which is orthogonal to the surface. The component parallel to the surface will not change. This means the light going towards a mirror, will go away from the mirror after reflection. But if it went from the left to the right, it will continue to go from the left to the right. Same with up…

### What is the angle of incidence the angle of reflection?

The angles of incidence and reflection are the angles between the normal to the reflector and the arriving/leaving light ray respectively. They're equal, which is a big help in solving problems that involve reflection. -- When the angle of incidence is zero, that means that the incident light hits the mirror perpendicularly, and it leaves along the same path on which it arrived. -- When the angle of incidence is 90 degrees, the angle of…

### What moves points a specified distance along a line parallel to a specified line?

Suppose the specified line has gradient m. Also suppose the specified distance is d.Then x = sqrt[d2/(1 + m2)] and y = m*x. A translation, by a distance x in the horizontal direction and y=mx in the vertical direction will move the point by the specified distance in the direction of the specified line.