Grade 8 Refraction of Light Quiz

What is the law of refraction?

• The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant

• The law of refraction is only applicable to transparent materials

• The law of refraction depends on the color of the light

• The law of refraction states that light always travels in a straight line

State the formula for the law of refraction.

• n1 + sin(theta1) = n2 + sin(theta2)

• n1 / sin(theta1) = n2 / sin(theta2)

• n1 * sin(theta1) = n2 * sin(theta2)

• n1 - sin(theta1) = n2 - sin(theta2)

Explain the concept of critical angle in refraction.

• The critical angle in refraction is the angle at which light passes through a medium without bending.

• The critical angle in refraction is the angle at which light is completely absorbed by the medium.

• The critical angle in refraction is the angle of incidence that produces an angle of refraction of 90 degrees.

• The critical angle in refraction is the angle at which light changes color as it passes through the medium.

What is the difference between the laws of reflection and refraction?

• The laws of reflection and refraction are the same

• The laws of reflection only apply to transparent materials

• The laws of refraction only apply to opaque materials

• The laws of reflection describe how light behaves when it bounces off a surface, while the laws of refraction describe how light behaves when it passes through a different medium.

Give an example of refraction in everyday life.

• Book on a table

• Pencil in a pencil holder

• Spoon in a bowl of soup

• Straw in a glass of water

What is the application of refraction in lenses?

• Focusing light and forming images

• Generating heat energy

• Reflecting radio waves

• Creating sound waves

How does refraction help in the working of a prism?

• Refraction separates the different colors of light

• Refraction combines the different colors of light

• Refraction has no effect on the working of a prism

• Refraction absorbs the different colors of light

Explain the role of refraction in the formation of a rainbow.

• Refraction causes sunlight to form a black hole

• Refraction makes sunlight disappear completely

• Refraction causes sunlight to separate into its component colors and form a rainbow.

• Refraction turns sunlight into sound waves

What is the use of refraction in optical fibers?

• To guide and transmit light signals through the fiber

• To reflect light signals through the fiber

• To absorb light signals in the fiber

• To block light signals from entering the fiber

How is refraction used in the functioning of a magnifying glass?

• It bends light rays to create a magnified image.

• It absorbs light to create a magnified image.

• It reflects light to create a magnified image.

• It has no effect on the magnification of the image.