Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fibre optics instead of mirrors and providing magnification operate on submarines and in various fields of science
 
        
             
        
        
        
centripetal acceleration is given by formula

given that


now we have




so the ratationa frequency is given by




 
        
             
        
        
        
Answer:
A lens
Explanation:
A lens forms images when light passes Through it bending the rays of in the process.A phenomena called refraction and the speed of light changes in the process because it enters a medium since it's wavelength is reduced.
 
        
             
        
        
        
Answer:
fact one 
Explanation:
fact two is going slower and a longer distance than fact one so fact one will get there first.
hope this helps
 
        
             
        
        
        
<span><u><em>This begins with the sun’s radiation,
which is absorbed differently on the earth’s surface. The earth's
surface is heated differently because of scenarios like cloud cover,
mountains, valleys, water bodies, vegetation and desert lands.</em></u>
<u><em></em></u>
<u><em>Good luck! </em></u></span><u><em></em></u>