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What is the ideal range of gain while selecting a screen in a front projector?

What is the ideal range of gain while selecting a screen in a front projector? Correct Answer 1.2 to 2

Screen quality is one of the essential features of front projector. While selecting the screen, particular attention should be paid to its gain (the reflectivity). Gain between a range of 1.2 to 2 is good because very high gain limits the viewing angle.

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