From the current object, select Actions --> Manage Security.
It will open a new window, where you can see the resulting access control to the current object in the current context.
You can select either "All Defined Access" or "My Access", or "Team Access" from the drop down list.
Also you can add participants for whom you want to see the resulting access control rule.
Click on 'i' symbol for a particular participant/role to know the access policy in detail.