What happens to light on the surface of water?

Water affects light rays in a similar way. When a light ray passes from air into water a similar thing occurs: the light ray is bent as it strikes the surface of the water. This ‘bending of a ray of light’ when it passes from one substance into another substance is called refraction.

What is the angle with which a fish in the water can see the outer objects?

A fish can see everything above it in clear water irrespective of its position in different depth. The critical angle for water is 48.5°. The angle of the cone of vision for the fish is twice of this angle. Hence it is 97°.

What is circle of illumination in ray optics?

The imaginary line that separates light from the darkness and day from the night is known as the circle of illumination. The circle of illumination bisects the equator while the circle of illumination separates light from darkness and day from night, the axis is a line along which the earth rotates.

How does Snell’s window work?

Snell’s window (also called Snell’s circle or optical man-hole) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. This phenomenon is caused by refraction of light entering water, and is governed by Snell’s Law.

How does light reflect in water?

Pure water is colorless, whether in a vapor, liquid, or solid phase. That is, the molecules of water cannot absorb visible light and so cannot yield colors like dye or pigment molecules. Water and glass not only reflect but also refract light. This means that as a light beam enters water or glass, the light bends.

At what angle must a fish look to see a crab sitting on the shore at the water’s edge?

At what angle must a fish underwater look in order to see a fisherman at the shore? (Note: n for water is 1.33.) Answer is 48.8 degree.

For which Colour critical angle is minimum?

violet colour
Critical angle is minimum for violet colour.

What is shadow circle in geography?

The imaginary line of longitude which is the dividing line between the illuminated and the darkened portions of the earth is known as Shadow circle or circle of illumination. …

Is the circle of illumination a great circle?

Examples of great circles include the Equator, all lines of longitude, the line that divides the earth into day and night called the circle of illumination , and the plane of ecliptic, which divides the earth into equal halves along the equator. Small circles are circles that cut the earth, but not into equal halves.

Why does light reflect underwater?

The light from the air above will be refracted so objects will appear to be somewhere other than where they “really” are. The light from some underwater objects will be reflected at the surface by total internal reflection–just as if the surface were a mirror–and mirror-images of them will appear above the water!

What is illumination radius?

The radius of illumination is, R=d√n22n21-n22 ….( 5) if the rarer medium outside is air, then n2=1 and we can take n1=n.