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- Observed that the ray, 'Fi', falling on a prismoid ring, 'ABC', is refracted and bent in the direction, 'iR', and falling on the side 'AC', at an angle of incidence greater than the critical, is totally reflected in the direction, 'Re', vintage line  Mouse Pad #395686674
 
	 
 
	
		
			
			
            
		
                
                 			
					
						
							Observed that the ray, 'Fi', falling on a prismoid ring, 'ABC', is refracted and bent in the direction, 'iR', and falling on the side 'AC', at an angle of incidence greater than the critical, is totally reflected in the direction, 'Re', vintage line  Mouse Pad #395686674