What is called critical angle?

What is called critical angle?

When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur.

Why do diamonds sparkle more than glass?

Diamond shine more than glass piece of the same shape.It is due to the refractive index of both the medium that is R.I of diamond is more than that of glass . Hence critical angle of glass is more than that of diamond causing more total internal reflection in diamond/making it shine.

What is the critical angle of water?

49 degrees

What is real apparent depth?

Real Depth is actual distance of an object beneath the surface, as would be measured by submerging a perfect ruler along with it. Apparent depth in a medium is the depth of an object in a denser medium as seen from the rarer medium. Its value is smaller than the real depth.

What is water apparent depth?

The apparent depth is the distance of the virtual image, I from the surface of the water. The real depth is the distance of the real object, O from the surface of the water.

Does the apparent depth increase or decrease?

The apparent depth of a tank of water changes when viewed obliquely. This is because light bends on travelling from one medium to another. The apparent depth of the tank when viewed obliquely is less than the near-normal viewing.

How does the refraction affect the length of the day?

The Sun is visible to us about 2 minutes before the actual sunrise, and about 2 minutes after the actual sunset because of atmospheric refraction. The time difference between actual sunrise and the apparent sunrise is about 2 minutes. The day is longer on Earth by about 4 minutes due to atmospheric refraction.

Which property of light ray does not change in refraction?

Frequency of Light does not change on refraction.