Straight Lines:
* In a vacuum: Light travels in a perfectly straight line in a vacuum, like outer space.
* In uniform mediums: Light travels in straight lines through uniform mediums like air, water, or glass.
Exceptions:
* Refraction: When light passes from one medium to another (like from air to water), it bends, changing its direction. This is called refraction.
* Diffraction: When light passes through a small opening or around an obstacle, it spreads out, creating diffraction patterns. This is called diffraction.
* Gravitational lensing: Massive objects like stars or galaxies can bend the path of light due to their strong gravitational field. This effect is called gravitational lensing.
Summary:
While light generally travels in straight lines, its path can be affected by factors like different mediums, obstacles, and gravitational fields.
