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                                    25. Define angle of minimum deviation. For a prism of angle A 60, the angle ofminimum deviation is 30°. Calculate its refractive index of the material of theprism14] | 
                            
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Answer»  A ray of light is deflected twice in a prism. The sum of these deflections is thedeviation angle. When the entrance and exitanglesare equal, thedeviation angleof a ray passing through a prism will be aminimum.  | 
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