Optics

What is reflection?

• Reflection is the change in direction of a wave when it bounces off a surface

• Reflection is the absorption of light by a surface

• Reflection is the emission of light from a source

• Reflection is the bending of light around an object

Answer explanation

Reflection is the change in direction of a wavefront at an interface between two different media.

Tags

NGSS.MS-PS4-2

Explain the difference between concave and convex mirrors.

• Concave mirrors are flat, while convex mirrors are curved.

• Concave mirrors converge light rays, while convex mirrors diverge light rays.

• Concave mirrors reflect light rays, while convex mirrors absorb light rays.

• Concave mirrors diverge light rays, while convex mirrors converge light rays.

How does refraction occur?

• Refraction occurs when light waves travel in a straight line

• Refraction occurs when light waves reflect off a surface

• Refraction occurs when light waves pass from one medium to another at an angle, causing the light to change speed and bend.

• Refraction occurs due to the absorption of light by a medium

Answer explanation

Refraction occurs when light waves pass from one medium to another at an angle, causing the light to change speed and bend.

Tags

NGSS.MS-PS4-2

Describe the role of lenses in optics.

• Lenses in optics are used for magnifying objects

• Lenses in optics are primarily used for color correction

• Lenses in optics have no impact on the behavior of light

• Lenses in optics bend and focus light rays, converging or diverging them to form images in optical instruments.

Answer explanation

Lenses in optics bend and focus light rays, converging or diverging them to form images in optical instruments.

Why an object appears broken when it is in water?

• The interactions of the particles of natural light.

• All colors of the spectrum (ROYGBIV)

• Light rays slow down when traveling from air to water. This causes a change in the object's appearance (broken or refracted).

• Air molecules scatter and reflect the light coming from the sun, unlike space which has no matter to reflect the light (besides the objects we can see from space).

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Scientists use telescopes to make distant object appear closer. Some parts of the telescope are shown here. Which of the following best describes what is happening?

• The objective lens produces light

• The objective lens blocks light

• The objective lens reflects light

• The objective lens refracts light

Scientists use telescopes to make distant objects appear closer. Some parts of a telescope are shown below. Which of the following best describes how the objective lens of this telescope helps a scientist observe the moon?

• The objective lens produces light.

• The objective lens blocks light.

• The objective lens reflects light.

• The objective lens refracts light.

A telescope that uses lenses and mirrors to collect and focus visible light is called an (a)  

• Refracting Telescope

• Reflecting Telescope

• Optical Telescope

• Radio Telescope

Visible ​ (a)   that the ​ (b)   can see is called the ​ (c)   spectrum.

• light

• eye

• electromagnetic

Tags

NGSS.MS-LS1-8

The distance that light can travel in a year is called (a)  

• A light second

• A light minute

• A light month

• A light year