neither, a shadow cant be darker unless your closer to the surface your pointing the light at.
Answer:
a,= 1m/second. b,= 0m/ second ( constance,no movement)
The normal force is always (underline, bold) is always perpendicular to the surface an object is sitting on. If the object is on an inclined plane, then the normal will not be vertical but it will be perpendicular to the angle of the incline.
The diagram below (left) shows a normal force (GH) that is not vertical, but it is perpendicular to the surface. The object on the right is the more usual normal a mass on a table top.
The vertical line on the right is the normal and it points up.
Diffraction is the slight bending of light when it passes around the edge of an object. The amount of bending depends on the relative of the wavelength of the light wave to the size of the opening. If the opening is much larger than the wavelength the bending will be almost unnoticeable but if the two are equal or closer in length then the diffraction will be noted. Therefore, the correct answer is bends.