Reflection Properties of Light in a Plane Mirror

Hello Everyone!

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Open Ended

One word that describes how you feel at this moment? (Your name first then your answer)

RECAP

Light travels in a straight line. But when it encounters an opaque barrier, it bounces off.

Light interacts differently on different materials

Classify the following objects as transparent, translucent, or opaque. 

On a sheet of paper, write the letter associated to each material in the appropriate part of the diagram. 

Venn Diagram

Reflection Properties of Light in a Plane Mirror

Learning Objectives:

• investigate the reflection properties of light using a plane mirror;

• apply the concept of reversal effect in mirrors on emergency

  transportations; and

• realize the benefits and risks of using two-way mirrors.

Open Ended

Why do we always like to look at the mirror?

How does light play a role while looking at yourself in front of the mirror?

Reflection

the return or bouncing of light from a surface

Types of reflection

• Specular

• Diffuse

Specular reflection is defined as light reflected from a smooth surface at a definite angle.

Diffuse reflection is produced by rough surfaces that tend to reflect light in all directions.

Law of Reflection

• It states that the angle of incidence is always equal to the angle of reflection.

• 
  

Guide Questions:

• Identify the correct Ray Diagram of reflection of light in a plane mirror.

• What happened to the ray of light when the younger boy focused the spotlight on the mirror?

• Describe the connection between the incident ray and the reflected ray.

• If you focus a flashlight at an angle of 15⁰, what do you think would be the angle of reflection? Explain why.

https://www.youtube.com/watch?v=vt-SG7Pn8UU

Multiple Select

Which of the illustrations below shows the correct Ray Diagram of reflection of light in a plane mirror?

What happened to the ray of light when the younger boy focused the spotlight in the mirror?

Describe the connection between the incident ray and the reflected ray.

Multiple Choice

If you focus a flashlight at an angle of 15⁰, what do you think would be the angle of reflection?

• 15⁰

• 30⁰

• 45⁰

• 60⁰

Two types of mirror

The plane mirror and the spherical/curved mirror.

The images formed may be different in terms of type, position, size, orientation, and location.

• Type of images -  real and virtual

• Position of images - upright (or erect) and inverted

• Size of the image - enlarged or magnified, same in size, smaller

• Orientation of the image - laterally reverse and not laterally reverse

• Location or distance of the image from the mirror.

Group presentation

REFLECTION PROPERTIES OF LIGHT USING PLANE MIRROR

Group presentation

Applying the concept of lateral reversal in mirrors on emergency transportations.

Enumerate the reflection properties of light using a plane mirror.

Use the pictograph as clue to complete the sentence.

Two-way mirror

Also known as two-way glass, which is reflective on one side and clear on the other, giving the appearance of a mirror to those who see the reflection but allowing people on the clear side to see through, as if at a window.

Poll

Interrogation room

• Beneficial

• Not beneficial

Dressing/Fitting Room

Poll

Dressing/Fitting room

• Beneficial

• Not beneficial

Mall/Shop Security

Poll

Mall/Shop Security

• Beneficial

• Not Beneficial

Car Windows

Poll

Car Windows

• Beneficial

• Not beneficial

Reflection Mo! Choose Mo!

Directions: Read the statement carefully and choose the correct answer.

Multiple Select

If you stand 1.83 m, your image appears _______ in a plane mirror.

• 1.38 m

• 1.83 m

Multiple Select

You stand in front of a plane mirror in a dressing room. You noticed that your image is ___________.

• upright and virtual

• inverted and real

Multiple Select

According to the law of reflection, the angle of incidence is ______ the angle of reflection.

• less than

• equal to

Multiple Select

The word LIGHT appears ________ when read in a plane mirror.

• LIGHT

• THGIL

Multiple Select

Some of the letters of the alphabet that do not show lateral inversion in a mirror are ________.

• M,O,V,X,T,A

• S,N,R,B,D,E

POST TEST

God bless everyone!