Light is refracted when it enters a material like water or glass. Depending on the density of the material, light will reduce in speed as it travels through, causing it to change direction. Ray ...

If the light rays are travelling from one medium to another they change their direction at the boundary between two mediums. When the light rays either bend or change their direction while passing ...

Please provide your email address to receive an email when new articles are posted on . Preoperative diagnosis of ocular surface disease is important. The variability of presentation among patients ...