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Mirror reflection and shadow
- 2. We see different type of Reflections in our daily life.
- 3. We use mirrors in the dressing room, washroom
- 4. Mirror in Car, Bus
- 5. The most familiar type of mirror in which we see our faces is the plane mirror, which has a flat surface.
- 6. MIRRORS • Mirror is a smooth surface which can change the direction of light falling on it. Mirror
- 8. MIRRORS • A piece of polished metal glass or polished metal can be used as a mirror
- 9. REFLECTIONS When light rays fall on a smooth and shiny surface, like glass, water or polished metal, the light ray bounces back, it is called the reflection of light
- 12. Difference between shadow and image Shadow • Shadow is formed when light does not reach behind the object. • No light enters the observer’s eyes. • Shadow does not provide such information • Shadow is never inverted Image • It is formed by intersection of reflected rays • Image is seen when reflected rays approach to observer’s eyes • Image gives more information such as color, structure etc. • Image can be straight or inverted.
Editor's Notes
- By definition mirror is a smooth surface which can change the direction of light falling on it such that it returns to the same medium. So in the picture you can see the torch light falling on the mirror plate and then return to the eye
- Now This is one question asked in Ncert book A patch of light is obtained at B,when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light A wooden board A glass sheet A mirror A sheet of white paper So in the question it is asked that what is A Here you can see that torch light is falling on A and then return toward the screen B So A is actually changing the direction of torch light falling on it As we know mirror can change the direction of light falling on it So we can say that A is a Mirror Hence ans is C
- Now, A piece of polished metal glass or polished metal can also be used as a mirror
- Now lets understand what is reflection? So When light rays fall on a smooth and shiny surface, like glass, water or polished metal, the light ray bounces back, it is called the reflection of light
- In the first picture you can see the torch light falling on the mirror plate and then return to the eye so this is reflection Again in second picture, you can see mountains in Lake just because of reflection And in the third one you can see refection of pencil from the polished metal surface.
- Now When light rays fall on a smooth surface it is not called as falling light but in physics we say it as incident ray So The light rays that fall on a surface is known as incident ray Similarly, The ray that bounces back is called as reflected ray. And when we draw a perpendicular to the surface means a line that makes 90 degree to the surface is called normal, Here very interesting thing you can see that incident ray, reflected ray and normal all are meeting at point P This point is known as point of coincidence. Form class 6 point of view till now it is enough to understand about mirror and reflection, for in details you will learn in class 8th. Still if you want to learn in details about reflection, I have given some links you can visit from there
- Now the last topic what is the difference between shadow and image