Laser is a good light source which is presently widely used in many areas,while laser is a basically polarized light,so it is very important to study the polarization of reflected light of linearly polarized light.

An artificial polarization-dependent delay is employed substitute for polarization maintaining fiber,a compact depolarizer for linearly polarized light with any direction of vibration is proposed.

The polarization station of the reflection light was discussed according to Snell s law and Fresnell s formula, on the condition that the linear polarized light generates the total reflection at the medium surface.

Two well-known general relativistic effects due to space-time curvature by mass and charge or angular momentum of a star are deflection of light and radar echo delay.