Yes when part of it is seen out of the water it tricks the eye
Objects appear larger underwater due to the refractive index of water. This causes light rays to bend as they pass through water, which makes objects look closer and larger than they actually are. Additionally, the distortion caused by the water can magnify the appearance of objects.
When light passes from air into water, it changes speed and direction due to differences in optical density, resulting in refraction. This change in direction can make objects appear bent or broken when viewed through a transparent medium like water. In reality, the ruler remains intact but is visually distorted due to the refraction of light.
Water bends or refracts light, not only do things look bigger they are not where they appear to be.
Most any liquid will distort light rays and make objects seen through the liquid as distorted. When you see the part of the rock through the liquid and part of it through the air, it will indeed look bent.
Objects will look larger when viewed through the side of a water-filled glass due to refraction. Light bends as it passes through the water and then again when it enters the air, causing the object to appear magnified.
because of refraction of light same principle as when you look at a straw in water and it looks broken
refraction is the cause================================Because light bends when it crosses the boundary between air and water,but when your brain judges the direction of an object, it assumes that thelight from it came to you straight.
Line segments can be broken down into points.
Light refraction caused by the water
When light passes through air and enters water, it changes speed and direction due to the different density of the two mediums. This causes the light rays to refract, making objects appear distorted, crooked, or broken when viewed through water. This phenomenon is known as refraction.
This optical illusion is caused by light refraction at the boundary between the air and water. When light passes from air to water, it changes direction due to the change in media, making the pencil appear broken or disjointed at the water's surface.
When light passes from air into water, it changes speed and bends due to the change in density between the two mediums. This bending of light causes an optical illusion that makes the stick look broken at the point where it enters the water.