الصوت والضوء: انكسار الضوء

The video tutorial explains the concept of light refraction, illustrating how straight objects appear bent when partially submerged in water, and how the sun appears oval at dusk and dawn. It discusses the absolute refractive index, which measures how much a medium slows down light, and provides examples of refractive indices for different materials, such as vacuum and water. The tutorial highlights the impact of medium density on light speed and direction.

What visual effect does light refraction have on a straight stick partially submerged in water?

• It appears shorter.

• It appears bent.

• It appears longer.

• It appears broken.

Why does the sun often appear oval when it is low in the sky?

• Due to the Earth's rotation.

• Because of atmospheric refraction.

• Because of the sun's natural shape.

• Due to cloud cover.

What happens to light waves when they pass from one medium to another with different density?

• They change color.

• They change speed.

• They disappear.

• They increase in intensity.

What does the absolute refractive index of a medium indicate?

• The degree to which it slows down light.

• The temperature of the medium.

• The speed of sound in the medium.

• The color of light it transmits.

What is the refractive index of water?

• 1.33

• 2.00

• 1.00

• 1.50