REFLECTION OF LIGHT IN
A PLANE MIRROR
PART 2
SCIENCE 10. QUARTER 2
OBJECTIVES:
1. Explain the law of reflection.
2. Compare the actual height, width and the
distance from the mirror of the object with that
of the image formed by the plane mirror.
3. Describe the image formed by plane mirror.
ACTIVITY 1: MIRROR, MIRROR ON THE WALL
THE MAN IN THE MIRROR
Suri, “Look in the Mirror
ACTIVITY 2: MY IMAGE AND ME
Directions: Analyze the nature of image formed by a plane
mirror.
GUIDE QUESTIONS:
1. What is the size of image formed by a plane mirror?
2. What type of image is formed by plane mirrors?
3. Where is the image of an object in a plane mirror?
4. Compare the distance of the man to the mirror and the
distance of his image from the mirror.
Reflection is the bouncing off light rays when it hits a surface
like a plane mirror.
Two types of images formed by reflecting surfaces.
1. Real image is always inverted and is formed by actual rays of
light. It appears in front of the mirror and can be projected
on the screen.
2. Virtual image is always erect and formed by apparent rays of
light. Virtual image appears behind the mirror.
Virtual Image
Real Image
Properties of an image formed by plane mirror
• The image obtained is virtual.
• The image is erect.
• The size of the image is same as the size of the object.
• The distance between the image obtained is same as the
distance between the object from the mirror.
LAWS OF REFLECTION
Angle of incidence is equal to the angle of reflection.
The incident ray, normal and the reflected ray all lie in
the same plane
Characteristics of Images Formed by Plane Mirrors
Location of Image
Orientation of Image
Size of Image
Type of Image
Behind the mirror
Upright
Same size as the object
Virtual
ACTIVITY 3: HOW DO I LOOK?
Directions: Analyze the given pictures below and answer
the questions that follow.
B
.
1. Which of the given pictures show an image on a plane
mirror?
2. Which of the mirrors has an image that is erect and
virtual?
ACTIVITY 3: continuation…
3. Consider the diagram below. Which one of the angles
(A, B, C, or D) is the angle of incidence? ______
Which one of the angles is the angle of reflection?______
ACTIVITY 3: continuation…
4. A ray of light is incident towards a plane mirror at an
angle of 30-degrees with the mirror surface.
What will be the angle of reflection? __________________
What will be the angle of incidence? __________________
ACTIVITY 3: continuation…
5. What is the relationship between the angles of
incidence and reflection?