Refractions and Lenses Quiz

According to pages 40-48 of Chapter 4 “Refractions and Lenses,” what causes the speed of light to slow down?

• The speed of light slows down when it hits an opaque object.

• The speed of light slows down during lightning storms.

• The speed of light cannot be slowed down because it is faster than anything known to man.

• The speed of light slows down when it travels through transparent objects.

Which of the following is the effect of Part A? Choose two correct answers.

• “Like mirrors, these lenses can be convex lenses or concave lenses.”

• “That is called refraction. It’s caused by the slowing down of light as it moves from air to water.”

• “Remember that something convex curves outward.”

• “As the light enters the water, it changes angle direction because it slows down.”

How does the diagram on page 49 help readers better understand the meaning of the terms convex and concave as they are used in the chapter?

• The diagram shows how magnifying lens work to be able to see things better.

• The diagram shows how light rays come together or spread apart depending on which lens type is used.

• The diagram shows that light rays can travel through any object.

• The diagram shows how light rays move in one direction.

Which two details from the chapter best describes the meaning to the diagram on page 49?

• “Do objects look larger or smaller through a convex lens?”

• “A convex lens refracts and bends light rays closer together.”

• “When you look through a convex lens, an object will look larger and closer.”

• “A concave lens refracts and spreads light rays apart.”

• “If you look through a concave lens, an object will look smaller.”

Which detail best helps readers better understand the meaning of the word peephole as it is used in the chapter?

• “In many homes and apartments, the peepholes of doors have two lenses, one of which is concave.”

• “Concave lenses are used in security cameras because they provide a wider view of a place.”

• “The other lens is convex and magnifies the image made by the concave lens.”

• “However, if you are looking from the inside out, you can see who is standing in front of your door.”

What does the word *refract* mean?

• Light that goes through an object.

• The appearance of light bending when it moves from one medium to another.

• Blocking all light so that none gets through, not clear.

• To take in or soak up.

Read the text on page 42 of the chapter “Refraction and Lenses?” What is the meaning of the word *denser* as it is used in the passage?

• shortest

• heavier

• hidden

• light

What is the main idea of Chapter 4 “Refraction and Lenses?”

• Earth would be cold with no sun.

• The speed of light slows down when passing through transparent objects.

• Light and heat energy are important for life on Earth.

• Light travels at a very fast speed.

Which two details from Chapter 4 best support the main idea?

• “When light moves through one thing that is transparent to something different that is transparent, it changes speed.”

• “It seems like magic, but it’s really just how light travels—no trick.”

• “When light passes through windows, water, and even air, it slows down.”

• “Light is important for many reasons.”

• “Without the light and heat energy from the sun, Earth would be freezing cold.”

Which text feature did you use today and how did it help you?

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