I think ravi and nisha has both crossed the boundaries of the company. Ravi should have followed ethical values and should not have logged on to nisha’s system on the other hand nisha purcahse in the stock market is against the rules and policies of the company.So weighing it on the weighing balance i think Nisha’s action were more on the wrong part while ravi’s actions are on an unethical ground.I think Ravi should not confront Nisha .He should directly report to the management regarding the actions of Nisha and should honestly accept his mistake in front of the management and assure them he would never ever think of doing any such act and moreover he is ready to be punished for it. Though Ravi is wrong but he is not cheating the company moreover Nisha should be punished by the management. Ravi should introspect himself and understand that he should not copy any presentation related material as that is also an offense and he may not be lucky every time and should apologise with the management for his deed.
