It's a tricky question, and I am answering from the point of view of an interested layman, not a physicist. Light travels on a straight path through space. The interesting reality is that the space around gravitational fields bends.Light travels in a straight path through bent space. Also, light can be transmitted through optical fibers in communications systems, and the light follows the fiber through whatever bends are put into it.
Light rays are bent and brought by a refraction.
There are two main areas of similarity. The first is that light passes through a converging lens as well as through a prism. This may sound trivial, but light will not pass through a block of wood! The second similarity is that in both situations the rays of light will be refracted: they will be bent at the boundaries between the different media.
Without getting too complicated, the "more dense medium"'s gravitational pull alters the path of the light. The ray of light will bend away from the normal.
because bent tube does not reflect light back .moreover light travels in a straight line
refraction
According to the General Theory of Relativity, the path of light is bent near large masses. The more massive a celestial object is the more light is bent near it.
In a sense, light does not bend. Light sometimes passes through space (or space-time) that is warped or bent because of a nearby object having very strong gravity. The light passes through this space in what (from the light's point of view) is a straight line. To other observers the light may appear to have followed a bent path. So gravity warps space-time, and light appears to bend as it travels through this warped space-time. The light isn't doing anything except following what is a completely natural path through space.
Light rays are bent and brought by a refraction.
There are two main areas of similarity. The first is that light passes through a converging lens as well as through a prism. This may sound trivial, but light will not pass through a block of wood! The second similarity is that in both situations the rays of light will be refracted: they will be bent at the boundaries between the different media.
Without getting too complicated, the "more dense medium"'s gravitational pull alters the path of the light. The ray of light will bend away from the normal.
light takes a straight path.
because bent tube does not reflect light back .moreover light travels in a straight line
the mirror is bent
refraction
The waves will be bent or reflected.
use a mirror to change the path of light.
how does water affect light path