Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.310 mm wide. the diffraction pattern is observed on a screen 3.40 m away. define the width of a bright fringe as the distance between the minima on either side. (a) what is the width of the central bright fringe? (b) what is the width of the first bright fringe on either side of the central one?

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wavelength divides in half and speed stays the same.

the answer is a. hope this .

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