Scale Metal

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A few questions on light. Please help me please!?

1) Why paper cannot be used as a reflecting surface.

2) A ray of light strikes a mirror at an angle of 30 degrees to the mirror surface. What is the angle of reflection.

3) A man stands 10m in front of a large mirror. How far must he walk before he is 5m away from his image.

4) A girl walks towards a mirror at 1.5ms^-1. At what speed does her image approach her?

Thank you so much guys!

1)A mirror is essentially a plate of glass coated with a thin film of metal, such as silver. At the atomic scale, metals are a crystal network of atoms whose outermost electrons dissociate and wander with high mobility through the network. These mobile conduction electrons are the source of electrical conductivity in metals, and when light attempts to penetrate a metal, they vibrate in such a way that an opposing electrical field is created, canceling the electric field of light and prohibiting any of its colors from entering beyond a few atomic layers. When that occurs, the light has been effectively reflected from the surface of the metal.
In addition, the smoothness of a mirror’s glass and metal coating ensure that this surface reflection is specular. As a result, rays of light bounce “like tennis balls,”, always maintaining an angle of reflection to the mirror’s surface, that matches in value the rays’ angle of incidence. Rays of light originating from a person’s ear, nose, and eyebrow, will “reflect with the same angle” off a smooth mirror surface and maintain their relative orientation, thus preserving the image that our eyes will perceive.
White surfaces can reflect a considerable amount of light, but without the mobile electrons to oppose the electric field of light, white surfaces allow light to penetrate up to several wavelengths. This allows them to experience multiple reflections from crystal grains and other irregularities within the structure of the surface. Some multiple-reflected light can reemerge from the material surface, but without the same orientation, as that which reflects off a mirror.
Surface roughness, also contributes “diffuse reflection,” causing the rays of light from different parts of a potential image to “bounce back at different angles.” Multiple and diffuse reflections scatter the reflecting rays, and all information about the image is lost.

2)angle of incidence = angle of reflection (laws of reflection) : specular

3) hint: the mirror image distance = mirror object distance (plane mirror)
4) same hint as above.

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HO Scale Roundhouse Monon 40 Metal Single Door Boxcar 499 C4515
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HO Scale Roundhouse Great Northern 40 Metal Single Door Boxcar 2527 C4615
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