Use the HR diagram below to answer the question. Labeled HR diagram. The main sequence slopes from the upper-left of the diagram, which is blue, to the bottom-left of the diagram, which is red-orange. White dwarfs cluster at the bottom of the diagram, in the light blue section. Red giants cluster in the middle of the diagram, in the orange-red section. Red supergiants cluster at the top of the diagram, in the orange-red section. What can be concluded about the initial mass of a blue main sequence star compared to a red main sequence star? Blue main sequence stars had a greater initial mass. Red main sequence stars had a greater initial mass. Blue main sequence stars have the same initial mass as red main sequence stars. Initial mass comparisons cannot be made between blue and red main sequence stars.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

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

elctricity and magnet is conversion to it