Convex mirrors can only produce virtual images because the focal point and the center of curvature of the convex mirror are imaginary points and that cannot be reached.
<h3>What is virtual image?</h3>
This is referred to the opposite of a real image and cannot be obtained on a screen. It is formed from the  apparent divergent of light rays from a point  and not the actual one which is the major difference it has with a real image.
It is usually produced by a convex mirror because the focal point and the center of curvature of the convex mirror are imaginary points which can't be reached.
Read more about Convex mirrors here brainly.com/question/14269744
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<u>Answer:</u> The Fermi velocity of lead is 64.4 km/s.
<u>Explanation:</u>
To calculate the Fermi velocity, we use the equation:

where,
h = Planck's constant = 
 = mass of electron =
 = mass of electron = 
N = Number of atoms present in per volume of atom multiplied by number of electrons present in given atom = 
 = Avogadro's number =
 = Avogadro's number =  (When the mass is in kilograms)
    (When the mass is in kilograms)
V = Volume = 
M = molecular weight of lead = 207.2 g/mol
Putting values in above equation, we get:

 (Conversion factor: 1 km = 1000 m)
     (Conversion factor: 1 km = 1000 m)
Hence, the Fermi velocity of lead is 64.4 km/s
 
        
             
        
        
        
an atom is chemically stable when its outer layer is completely filled with energy. im pretty sure this is right
 
        
             
        
        
        
Pictures you asked, I hope you like the pictures