Cathode-ray tube with reduced moire

Cathode-ray tubes with a shadow mask effective in minimizing the moiré effect are disclosed. The shadow mask has a plurality of apertures allowing electron beams to pass through, where a vertical pitch P y between each of the neighboring apertures along a minor axis of the shadow mask and a scanning pitch P s between each of the scan lines of the electron beams satisfy the following relationship: ((2 n +1)/4)−0.1 P s /P y ((2 n +1)/4)+0.1 where n is an integer not less than three.