Light and Matter Unit Review

What happens to light when it reaches the calm lake surface?

• It scatters.

• It reflects clearly.

• It diffuses.

• It absorbs.

What can be concluded about light and vision from the class investigations?

• Light conditions alter how we see reflections and objects through glass.

• Objects inside are always less visible than reflections.

• Reflections will always be the same regardless of light conditions.

• We see better in the dark with no light source inside.

What causes someone to be nearsighted?

• The eye being perfectly spherical

• The eye focusing light too far behind the retina

• The eye being longer than normal from front to back

• The lenses in glasses being too thick

Why does the iris change the size of the pupil?

• To improve the eye's ability to see at night

• To signal different emotions

• To change the color of the eye

• To control how much light enters the eye depending on brightness

What happens when light from Room A's light source shines directly on the one-way mirror toward the teacher?

• Most of the light is reflected back, while some is absorbed or passes through to the teacher's side.

• The light goes through the mirror without any reflection.

• The light immediately dims and does not affect the mirror.

• The mirror becomes completely transparent.

Based on the light inputs to their eyes, what would the music student expect to see?

• The student primarily sees their own reflection and faintly the teacher's.

• The student cannot see anything at all.

• The student clearly sees both themselves and the teacher with equal brightness.

• The student only sees the teacher and not themselves.

What is the main purpose of conducting an investigation on how light interacts with different materials such as a one-way mirror, glass, or a regular mirror?

• To determine which material is the heaviest

• To find out which material is the most expensive

• To decide which material looks the best in a box model

• To understand how light is reflected and transmitted by each material

Why is it necessary to keep the experimental conditions the same while testing each material?

• To prevent the light meter from recalibrating

• To ensure that the results are solely due to the differences in materials

• So that the materials do not have to be changed

• To use less light during the investigation

Why can't light transmit through a regular mirror?

• Because the mirror is always placed in dark areas

• Because light is absorbed by the glass

• Because the glass is too thick for light to pass through

• Because the silver layer and paint make the mirror opaque

What does 'half-silvered' mean in the context of one-way mirrors?

• The silver layer is thin, creating a blend of transparent and reflective surfaces.

• The silver is only applied to the edges of the mirror.

• The silver is mixed with another metal to reduce its reflectivity.

• Half of the mirror's surface is covered with silver, and half is left as plain glass.