When driving a car during sunny days, the dazzling sunlight reflected from the road surface or the glass of surrounding buildings often makes the eyes unable to open. Due to the fact that light is a transverse wave, this strong scattered light from above oscillates horizontally. Therefore, simply wearing a pair of polarized sunglasses that can only transmit vertically polarized light can block some of the scattered light.

The front window glass of the driver's cab and the glass cover of the car lights are both equipped with polarizers, and their polarization direction is specified to be in the same direction and at a 45-degree angle to the horizontal. The driver can only see the light emitted by their own car lights from the front window, and cannot see the light from the opposite car lights. When driving at night, neither turn off the lights nor slow down to ensure safe driving.

When shooting a stereoscopic movie, the lenses of two cameras are equivalent to two eyes of a person. They simultaneously capture two portraits of the same object, and during projection, both portraits are simultaneously projected on the screen.

During projection, two projectors place a polarizer on each camera lens, with the polarization directions of the two polarizers perpendicular to each other. The audience wears glasses made of polarizers, and the polarization direction of the left eye polarizer is the same as that of the left projector. The polarization direction of the right eye polarizer is the same as that of the right projector so that the two images on the screen are observed through two eyes, A three-dimensional image is formed in the human mind.