Ans: This so called notch is seen only in a 'single sided' = ' single coated' film, where the emulsion is coated only on one side of the film, and to help identify the emulsion side of the film a notch is given in the top right hand corner. Once the film is kept with notch is on our top-right, the emulsion side is nearer to us. This side should be made in contact with the intensifying screen while mounting into a cassette for XR.
Of course while mounting films on to the lobby, the notch is usually should be on the top-right hand corner.
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