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                              Q:
                           
                           
                                                      | A) Optical microscopes | B) Scanning tunneling microscopes | 
| C) Electron microscopes | D) None of the above | 
                              Answer:   B) Scanning tunneling microscopes
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Microscopes are of three types. They are :
1) Optical microscopes
2) Electron microscopes
3) Scanning tunneling microscopes
 
Scanning tunneling microscopes are the microscopes that are used to view metal surfaces.
 
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