Question

horizontal retrace and vertivcal retrace?

Answer 1

Answer:

The return to the left of the screen, after refreshing each scan line is called the horizontal retrace. And at the end of each frame, the electron beam returns to the top left corner of the screen to begin the next frame is called the vertical retrace.

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Answer 2

Answer:

• Horizontal retrace : On raster-scan display , at the end of each scan line, the electron beam returns to the left side of the screen to begin displaying the next scan line. The return to the left of the screen refreshing each scan line , is called the Horizontal retrace of the electron beam.

• Vertical retrace : On raster-scan display, at the end of each frame (displayed in 1/80th  to 1/60th of a second ), the electron beam returns to the top of the left corner of the screen to begin the next frame. This is called Vertical retrace of the electron beam.