Challenging Light Questions for Grade 8

Which of the following best explains why we see objects?

• A. Objects absorb all the light that hits them.

• B. Objects emit their own light, which enters our eyes.

• C. Objects reflect or scatter light into our eyes.

• D. Light travels directly from the Sun into our eyes to illuminate objects.

If a ray of light hits a plane mirror at an angle of 35°, what will the angle between the incident ray and the reflected ray be?

• A. 35°

• B. 70°

• C. 90°

• D. 45°

Which of the following phenomena involves light changing direction but not speed?

• A. Diffraction around an object.

• B. Reflection off a shiny surface.

• C. Refraction through glass.

• D. Dispersion through a prism.

Light travels faster in air than in water.

• True

• False

The angle of incidence is always equal to the angle of refraction.

• True

• False

A convex lens always produces a magnified image.

• True

• False

A black object reflects no light at all.

• True

• False

A virtual image formed by a mirror cannot be projected onto a screen.

• True

• False

A ray of light passing through the focal point of a concave mirror will reflect parallel to the principal axis.

• True

• False

A prism splits white light into a spectrum because light waves of different colors travel at different speeds in glass.

• True

• False