9Science

Reflection and Refraction Review

Index of Refraction

• 1 on the index is equal to no bending at all....light travels straight through a vacuum.

• The higher the index of refraction the more the light bends

Types of lenses

• Concave Lens

• Convex Lens

Concave Lens

• "caves in" on either side of lens

• thinner in the middle than at the edges

• The parallel light rays enter and then exit angled away from one another never meeting at a focal point

• Like a Convex Mirror it produces only virtual images

Convex Lens

• Thicker in the center than the edges

• As parallel light rays enter the lens they exit at an angle so they meet at a focal point

• If the object is between the focal point and the lens then a virtual image is produced

• If the object is beyond the focal point then a real image is produced.

Multiple Choice

Light refracts when:

• It changes speed

• It changes from a particle to a wave

• Its density changes

• It encounters a solid object

Multiple Choice

Why does the straw appear to be bent?

• light is reflected

• light is absorbed

• light is turned

• light is refracted

Multiple Choice

What do we call a material that light can travel through?

• air

• water

• medium

• pathway

Multiple Choice

The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-

• absorbed
• stopped
• reflected
• refracted

Multiple Choice

Why does the lower part of the child appear so much different in size from the upper part?

• The light rays that travel through water and then into air are refracted.
• The light rays that travel through water and then into air are enlarged.
• The light rays that travel through air and then into water are reflected.
• The light rays that travel through air and then into water are reduced.

Multiple Choice

What is the angle of reflection equal to?

• The angle of refraction

• The angle of incidence

• The angle of absorption

• The angle of light

Multiple Choice

What might explain why light travels in a straight line?

• If there is nothing to interfere with light waves, they should travel in a straight line.

• Light waves will always travel in a straight line, even if they come into contact with another object.

• Light waves don't travel in a straight line.

• Light waves travel in a straight line because sound waves travel in a straight line.

Multiple Choice

What is the angle of incidence?

• The angle at which light bends in water.

• The angle at which light hits a surface.

• The angle at which light is absorbed by an object.

• The angle at which light bounces off a surface.

Multiple Choice

According to the Law of reflection, a light ray striking a mirror

• continues moving through the mirror in the same direction
• moves into the mirror at a slightly different angle
• bounces off the mirror toward the direction it came from
• bounces off the mirror at the same angle it hits.

Multiple Choice

What is the angle of reflection (θ_r) in the image?

• 56^o

• 90^o

• 124^o

• 34^o

Multiple Choice

Light bending as it passes through a rain drop is an example of...

• Refraction
• Reflection

Multiple Choice

A beam of light bends when it passes from air into water, and more when it passes from water into glass. What can you conclude from this fact?

• Air is denser than glass

• Water is denser than glass

• Glass is denser than water

• Air is denser than water

Multiple Choice

A light ray is incident from water to air. Which of the refracted rays is correct?

• A

• B

• C

• D

Multiple Choice

Density is...

• the amount of mass in an object
• the amount of space an object takes up
• the amount of mass in a given space
• the weight of an object

Multiple Choice

The line 90 degress through the refracting or reflecting surface is called?

• Medium

• Normal

• Incidence

• Reflection

Multiple Choice

The incident ray is the light ray leaving the light source. The angle of ______________ correlates with the incident ray.

• Incidence

• Reflection

• Refraction

• Normal

Multiple Choice

Objects that reflect well are

• Matte surfaces

• Smooth, shiny surfaces

• Dark coloured surfaces

• Medium coloured surfaces

Multiple Choice

The law of reflection states that

• Angle of incidence = Angle of reflection

• Angle of incidence = Angle of incidence

• Angle of reflection = Angle of translucence

• Angle of reflection = Angle of reflection

Multiple Choice

A concave mirror

• Curves inwards

• Curves outwards

• Curves sideways

• Curves in multiple directions

Multiple Choice

A convex mirror

• Curves inwards

• Curves outwards

• Curves sideways

• Curves in multiple directions

Multiple Choice

The angle of reflection is

• 90 degrees

• 55 degrees

• 45 degrees

• 135 degrees

Multiple Choice

Refraction is

• The bending of light as it passes through the one substance at an angle

• A light beam shone in one end of an optical fibre and totally internally reflected at the other end

• The bending of light as it passes from one substance to another at an angle

• A type of convex object used in everyday life

Multiple Choice

The light we can see forms which part of the electromagnetic spectrum?

• Infrared

• Ultraviolet

• Visible

• Radio

Multiple Choice

In which medium will light travel the slowest?

• ruby

• diamond

• vegetable oil

• air

Open Ended

If light moved from air into a diamond, what would happen to the speed of light?

Multiple Choice

When the refracted light ray bends towards the normal, is it moving faster or slower in the new medium?

• Faster

• Slower

Multiple Choice

Describe what happens to the speed of light as it moves from the glass into air.

• speeds up

• slows down

• remains constant

Multiple Choice

Refraction is when light...

• Bounces

• Transmits

• Bends

• Absorbs

Multiple Choice

Reflection is when light...

• Bends

• Bounces

• Absorbs

• transmits

Multiple Choice

How does light travel?

• in a wavy path
• in a straight path
• in a zig zag path

Multiple Choice

What are three things that can happen when light hits an object?

• Regular, Diffuse, Obtuse

• Reflection, Refraction, and Absorption

• Concave, Convex, Plane

Open Ended

If you friend was away today and still didn't understand Reflection and Refraction, summarise it for them in an Instagram message:

(Make sure you include the key definitions of both and possibly even an example to help them out!)

Dropdown

Light travels ​

Select answer

in air than it does in glass.

Drag and Drop

Between which two substances would there be most refraction?

​

Placeholder

and ​

Placeholder

Drag these tiles and drop them in the correct blank above

air

diamond

water

corn oil

glycerol

Drag and Drop

Between which two substances would there be no refraction?

​

Placeholder

and ​

Placeholder

Drag these tiles and drop them in the correct blank above

corn oil

glycerol

air

water

diamond

Dropdown

When light passes into a medium where it slows down, the light bends ​

Select answer

the normal.

Dropdown

When light passes into a medium where it speeds up, the light bends ​

Select answer

the normal.