Grade 6 Physics Quiz: Light Reflection, Refraction, and Periscope

What is reflection of light?

• Refraction of light when it enters a different medium

• Scattering of light when it passes through a medium

• Bouncing back of light when it strikes a surface

• Absorption of light by a surface

Explain how a periscope works.

• A periscope works by using prisms to scatter light.

• A periscope works by using mirrors to reflect light.

• A periscope works by using magnets to attract light.

• A periscope works by using lenses to bend light.

What is the law of reflection?

• The angle of reflection is always 90 degrees.

• The angle of reflection is perpendicular to the angle of incidence.

• The angle of incidence is equal to the angle of reflection.

• The angle of incidence is greater than the angle of reflection.

How does refraction of light occur?

• When light stops moving

• When light changes color

• When light passes through a vacuum

• When light passes from one medium to another, causing a change in its speed and direction.

What happens to the speed of light when it enters a denser medium?

• Speed increases

• Speed remains the same

• Speed becomes zero

• Speed decreases

Describe the role of prisms in the refraction of light.

• Prisms have no effect on the refraction of light.

• Prisms bend and separate light into its component colors.

• Prisms speed up the light and make it travel faster.

• Prisms absorb light and make it invisible.

How many mirrors are used in a simple periscope?

• Three

• Two

• Four

• Five

What is the purpose of using a periscope?

• To communicate with submarines

• To see objects that are not in the direct line of sight

• To listen to underwater sounds

• To measure the depth of a swimming pool

Explain the concept of total internal reflection.

• Total internal reflection is the process of light passing through a medium and splitting into different colors.

• Total internal reflection occurs when a light ray traveling from a denser medium to a less dense medium is reflected back into the denser medium instead of refracting out of it.

• Total internal reflection happens when a light ray passes through a medium without any change in direction.

• Total internal reflection occurs when a light ray travels from a less dense medium to a denser medium and refracts out of it.

What are the applications of periscopes in real life?

• Binoculars

• Telescopes

• Submarines

• Microscopes