Reflection of Light in Mirrors (Science 10) Q2 PDF

MIRRO RS Science 10 2nd Quarter  We all have mirrors at home. When we look at the mirror, we can see our own image in the mirror. That image is produced by the reflection of light rays. TYPES OF MIRRORS  PLANE SPHERICAL/ MIRROR CURVED...

MIRRO RS Science 10 2nd Quarter  We all have mirrors at home. When we look at the mirror, we can see our own image in the mirror. That image is produced by the reflection of light rays. TYPES OF MIRRORS  PLANE SPHERICAL/ MIRROR CURVED MIRROR A plane A curved mirror is a mirror is a mirror with a flat mirror with a (planar) curved reflecting MIRRO RS Science 10 2nd Quarter B_O_ U _ _NCC_ E L_ I_ G GH_ _T R _E_F_ L_ E _ _C TT _I _O_ N  REFLECTION of light refers REFLECTION occurs when light rays bounces back upon hitting an object like mirror. to the bouncing back of light when it hits a reflective surface. Light that hits the object Light that bounces off  Additional Terms: Incident ? Ray- the ray of light approaching the mirror. Represented by an arrow approaching the mirror. Reflected ? Ray- the ray of light which leaves the mirror. Represented by an arrow pointing away from the mirror. Normal ? Line- an imaginary line that can be drawn perpendicular to the mirror's surface.  Normal ? line Incident ? Reflected ? ray ray Angle of Angle of ? incidence ? reflectio n PLANE MIRROR  Additional Terms: Angle of Incidence - the angle formed between the incident ray and normal line. Angle of Reflection - the angle formed between the normal line and the reflected ray.  Normal line Incident Reflected ray ray Angle of Angle of incidence reflectio n PLANE MIRROR  Normal line Incident Reflected ray ray Angle of Angle of incidence reflectio n PLANE MIRROR  Normal line Incident Reflected ray ray Angle of Angle of incidence reflectio n PLANE MIRROR MIRRO RS Science 10 2nd Quarter  Normal ? line Incident ? Reflected ? ray ray Angle of Angle of ? incidence ? reflectio n PLANE MIRROR  The Law of Reflection The angle of incidence is? equal to the angle of reflection 45º 45º Light Light that that that hits bounces off the object  Types of Reflection Figure Figure A B GUIDE QUESTION: How does the condition of the reflective surface (water) affected the formation of the reflected image?  IMAGE FORMED BY PLANE MIRROR  Mirrors have many uses. The mirror we commonly use at home is called PLANE MIRROR. Plane mirrors are very useful because they form an image that is exactly the same with the actual object in terms of position and size. We can describe the image formed by a mirror in terms of… Location In front of the Behind the mirror mirror Orientation Upright/ Erect Inverted Size Reduced or Same Size Enlarged Type Virtual Real  Orientation – pertains to the position of the image in relation to the object Inverted Upright  Size – pertains to the size of the image formed in relation to the object Reduced Same size Enlarged TYPE: Real vs. Virtual Image Front of the Mirror/Reflec tive Side of the Mirror Seems to appear behind the mirror Seems to appear in front of the mirror We can describe the image formed by a mirror in terms of… Location In front of the Behind the mirror mirror Orientation Upright/ Erect Inverted Size Reduced or Same Size Enlarged Type Virtual Real  Describe the image formed by the plane mirror in terms of its L- O-S-T PLANE MIRROS produce image that are… Location Behind the mirror In front of the mirror Orientation Upright/ Erect Inverted Size Reduced or Enlarged Same Size Type Virtual Real  Have you noticed the word ‘AMBULANCE’ in an ambulance car? How is it written? Did you ever wonder why it is written that way? This is the answer! Mirror Left-Right Reversal Effect  The girl in the picture is brushing her teeth using her left hand. However, you will see in the image formed that she is brushing her teeth with her left hand. This effect is known as the mirror left-right reversal. Mirror Left-Right Reversal Effect ACTIVITY : Investigat ing Mirrors I. Objectives: a. Investigate the characteristics of the types of mirrors. II. Materials: - Set of Mirrors III. Procedures: 1.You will be given one (1) set of mirrors. Ensure that each set of mirrors must have three (3) different types. 2.Study and observe the different sets of mirrors in terms of their characteristics. 3.Write your observations on the given table and answer the following guide questions.  LAWS OF REFLECTION (IMAGES FORMED BY PLANE MIRROR) Objectives: Explain the process of reflection on plane mirrors; Illustrate images formed in plane mirrors using ray diagram (four principal ray); Determine the qualitative characteristics of images formed in plane mirrors. Two Types of Mirror Plane Mirrors Curved Mirrors are mirrors with flat surface; are mirrors with curved these are the usual mirrors we reflecting surface and derived use in our houses that show our from a spherical mirror. reflection. Activity: Angle of Incidence vs. Angle of Reflection Compare the angle of incidence and the angle of reflection. State one of the laws of reflection.  Setup: Plane Mirror Protrac tor Laser  Additional Terms: Incident ? Ray- the ray of light approaching the mirror. Represented by an arrow approaching the mirror. Reflected ? Ray- the ray of light which leaves the mirror. Represented by an arrow pointing away from the mirror. Normal ? Line- an imaginary line that can be drawn perpendicular to the mirror's surface. Reflecte d Ray Inciden t Ray  LAWS OF REFLECTION (IMAGES FORMED BY PLANE MIRROR) Ray Diagram of Plane Mirror Obje Imag ct e  Draw your plane mirror, perpendicular to your normal line. Place your object along the normal line. Draw a line from the tip of the object # going to the 1 intersection of your mirror and normal line (#1). Measure the angle of Normal line incidence then draw the reflected ray using the same degree for angle of reflection. Extend your reflected  Draw a line going to the mirror parallel Mirror to your normal line (#2). # The angle of 2 # incidence is 0, 1 therefore it go back over its path. Normal line Extend your reflected ray at the back of your mirror (you may use  Draw a another line from the top of your object going to your mirror in any direction (#3). Note: Place # Mirro another normal line as Ɵ your reference for the 3 r 2nd Normal Ɵ line reflected ray. # Measure the angle of # 2 incidence then draw 1 the reflected ray using the same degree for angle of reflection. Extend your reflected Normal ray at the back of your line mirror (you may use broken line). The intersection of your light ray marks the tip of your image.  IMAGES FORMED BY CURVED MIRRORS Science 10 2nd Quarter- Week 5 Compare the plane and curve mirror Construct a ray diagram for plane mirror. Decode the given symbolic representations to identify the characteristics of a plane mirror. U P R I G H T V I R T U A L S A M E S I Z E Describe the IMAGE formed by a Plane Mirror using the LOST format.  Aside from plane mirrors, there are also other types of mirror that can produce images… these are known as spherical mirrors or curved mirrors.  Two Types of Curved Mirror Concave Mirror- the Convex Mirror- the reflective surface reflective surface bulges towards from bulges away from the the light source also light source. Also known as known as diverging converging mirror mirror. Reflected light rays “converge” Reflected light rays “diverge” Important Points Center of Curvature (C)- the center of the sphere of which the mirror is part. Vertex (V)- the center of the mirror. Focal Point/Focus (F)- the point between the center of curvature and vertex. Principal Axis (P)- an imaginary line that going through the vertex that is perpendicular to the Describing the image formed using L-O- S-T LOCATION ORIENTAT SIZE TYPE L ION O S T beyond C Upright Reduce Virtu at C Inverted d al between C and Enlarge Real F d at F Same between F and Size V RAY DIAGRAM Helps us predict the qualitative characteristics of the image that will be formed in the mirror in terms of its L-O-S-T by using arrows and lines that represent light rays.  Case 1: Object is located beyond C  STEP 1-From the tip of an object, draw a line parallel to the principal axis and reflects back passing through the focus (F).  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. Image formed  Describe the image formed in terms of its L-O-S-T L- bet C & F- O inverted S- reduced T- real Image formed LOST if the object is beyond C  Case 2: Object is located at C  STEP 1-From the tip of an object, draw a line parallel to the principal axis and reflects back passing through the focus (F).  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. Image formed  Describe the image formed in terms of its L-O-S-T L- at C O- inverted S- same size T- real Image formed LOST if the object is located at C  Case 3: Object is located between C and F  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. Image formed  Describe the image formed in terms of its L-O-S-T L- beyond C- O inverted S- enlarged T- real LOST if the object is located between C and F  Case 4: Object is located at F  STEP 1-From the tip of an object, draw a line parallel to the principal axis and reflects back passing through the focus (F).  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. No Image formed  Case 5: Object is located between F and V  STEP 1-From the tip of an object, draw a line parallel to the principal axis and reflects back passing through the focus (F).  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. Image formed  STEP 2-From the tip of an object, draw a line that passes through the focus (F) and reflects back parallel to the principal axis. L- behind the mirror O- upright S- enlarged T- virtual Image formed LOST if the object is located between F and V  QUESTION - What did you notice about the image produced by the moving ball? - Do you think the location of the ball place an important role in the images Summary of Cases Orientatio Location Size of Type of n of Location of Image Image Image Image of Object Formed Formed Formed Formed (L) (S) (T) (O) Between Beyond C Inverted Reduced Real C&F At C At C Inverted Same size Real Between Beyond C Inverted Enlarged Real C&F At F No Image Formed Between F Behind Upright Enlarged Virtual &V the mirror  Rules for Drawing a Ray Diagram in a Convex Mirror  Image formed by Convex Mirrors Unlike concave mirrors, convex mirrors always produce images that share same characteristics. The location of the object does not affect the characteristics of the image. As such, the characteristics of the images formed by convex mirrors are easily predictable.  L- behind the mirror O- upright S- reduced T- virtual Image formed Use of Concave Mirrors The images formed by concave mirrors are usually larger than the actual object, that is the reason why dentists use concave mirrors when checking our teeth to see a larger view of them. Use of Convex Mirrors The images formed by convex mirrors are usually smaller than the actual size of the object. These mirrors are usually used for security purpose in store because they give a wider reflected view allowing owners to see a large area of the store.