How would you describe the two projectors used to screen a 3d movie?
a )both projectors have vertical polarizers.
b) one projector has a vertical polarizer and the other has a horizontal polarizer. c)both projectors have horizontal polarizers.
d)one projector is horizontal and the other is aligned at an angle to it.

B) One projector has a vertical polarizer and the other has a horizontal polarizer.

Explanation:

In 3D movies the picture received by the observer is always formed by two different glasses.

One of the glass will form the image in horizontal plane while other glass will form image in vertical plane

When these two images are overlapped on the person mind then it will give and idea of height , width and depth.

So this type of image formation is known as 3 D image formation

so here correct answer will be

B) One projector has a vertical polarizer and the other has a horizontal polarizer.

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c) up is the direction the magnetic force is acting on the charge.