Concave Mirrors

The concave mirror is the inside of the spherical surface is the reflecting surface.
The characteristic of concave mirror to collect of rays or CONVERGEN
The cut point of focusing reflected rays mentioned FOCUS LENGTH
The parts of concave mirror

 

Explainations of the above figure

C   =  center of mirror curve or radius of curvature

F   =the mirror focal point or focal length

V   = the mirror vertex

FV  = the distance of mirror focal length 

CV =The mirror radius

The principle rays of concave mirror

Reflection of Light in a Pane Mirror and the number of the image formed

Formation of virtual image by a plane mirror

 

 1. Good reflector of light 
     a. Light ray does not actually pass through the mirror (behind the mirror).
     b. It only appears to an observer as through the ray comes behind the mirror
2. The image is a virtual image

     a. Virtual image cannot be projected or focused on to a screen
     b. Image formed behind the mirror

Physics assignment for grade 8

Answer the question below briefly and correctly!

1. An object is placed at the distance of 10 cm in front of a plane mirror. Then the mirror is move 3 cm a far closer to object.Determine:
a. The distance between an object with its image, before moved
b. The distance between an object with its image, after moved
c. The distance between the first image with the second image

2. Two plane mirrors are pinched together to form an angle of 45 degree. Determine the number of the image formed by both mirrors.

3. Two plane mirrors are pinched together to form certain an angle . If the number of image that happened is 11 image,determine the number of the angle by bothmirrors.

4. Sketch-ray diagram and determine the image nature/property  formed  by a plane mirror of an object below!










 

5.      Diagram as follows shown image from o’clock in a plane mirror. What time which shown by the o’clock? 

The reflection of light

The light reflection of laws
1. The Incident ray, The normal line, and reflected ray to the surface at the point
of incidence all lie on the same plane
2. The angle of incident ray equal with the angle reflected ray

The light reflections 

The definition and the characteristic of light

A. The definition of Light

In daily life, light has an important role. We can see the object because light is reflected from the object to our eyes. When we looked into the mirror, we will see our image so that we can tidy-up our clothes and hair. Is it possible for us to look our self in the mirror, read a book, or see an object in a dark room?
Light travels in a straight line in a vacuum or uniform medium.

Penyelesaian Soal-soal Gerak Tanpa Rumus

UPAYA MENINGKATKAN KEMAMPUAN KONSEP GERAK

MELALUI PEMBELAJARAN KONSEPTUAL INTERAKTIF

BERBASIS KONSTRUKTIVISME DENGAN MODEL BELAJAR

KOOPERATIF STADS TANPA FORMULASI

              PADA MATA PELAJARAN FISIKA

A.     Latar Belakang Masalah

 Belajar Fisika bagi sebagian besar siswa masih menjadi momok yang menakutkan, karena sulit. Hal Ini disebabkan rumus yang seharusnya menjadi alat mempercepat perhitungan soal, justru akhirnya mempersulit siswa. Penyelesaian soal fisika menjadi sulit karena anak terbelenggu dengan banyaknya rumus. Ini tidak bisa dimungkiri karena sistem pengajaran fisika di sekolah masih banyak yang berorientasi pada penyelesaian soal dengan rumus. Begitu banyak rumus yang harus dihafal, tetapi anak tidak banyak yang memahami konsep yang diturunkan dalam rumus itu. Metode pembelajaran fisika yang mudah, menarik, dan menantang bagi anak didik merupakan impian bagi setiap guru fisika.

LIGHT

A. Reflection of light
B. Refraction of light
C. Thin lenses

Objectives

• Recall and use the terms for reflection, including normal, angle of incidence and angle of reflection.
• State that, for reflection, the angle of incidence is equal to the angle or reflection and use this principle in constructions, measurements and calculations
• Recall and use the term for refraction, including normal, angle of incidence and angle of refraction.
• Define refractive index of a medium in terms of the ratio of speed of light in vacuum and in the medium
• Explain the terms critical angle and total internal reflection.
• Identify the main ideas in total internal reflection and apply them to the use of optical fibers in telecommunication and state the advantages of their use.
• Describe the action of mirror ( both concave and convex) on a beam of light
• Describe the action of thin lens ( both converging and diverging) on a beam of light.
• Define the term focal length for a converging lens
• Draw ray diagram to illustrate the formation of real and virtual images of an object by a thin converging lens