You shine a laser beam through a grating with a known number of slits per millimeter and observe a pattern on a screen. Then you cover half of the grating with nontransparent material. What will you see

(a) There will be half as many bright fringes on the screen.(b) The bright fringes will be twice as close.(c) The bright fringes will be two times farther apart.(d) The location of the fringes will not change, but they will be a little bit wider and less bright.

d) The location of the fringes will not change, but they will be a little bit wider and less bright.

Explanation:

When one blocks half of the grating slits, the intensity of the interacting light is reduced, which reduces the brightness of the light. The angle of interference on the screen increases, thus is due to the reduced intensity of the light beams which makes the pattern become wider.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia