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Light GS

The document explains the concept of light reflection, distinguishing between diffuse and regular reflection based on surface smoothness. It outlines the laws of reflection and describes the properties of images formed by plane mirrors, including their size, distance, and orientation. Additionally, it provides a detailed experiment to determine the position of an image in a plane mirror and lists various uses of plane mirrors.

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lilcreepychristian
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8 views2 pages

Light GS

The document explains the concept of light reflection, distinguishing between diffuse and regular reflection based on surface smoothness. It outlines the laws of reflection and describes the properties of images formed by plane mirrors, including their size, distance, and orientation. Additionally, it provides a detailed experiment to determine the position of an image in a plane mirror and lists various uses of plane mirrors.

Uploaded by

lilcreepychristian
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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LIGHT

REFLECTION OF LIGHT
Reflection is the bouncing back of light when it falls on an object.

When light falls on an object like a book, it bounces in all directions because the surface is a
bit rough. This is called Diffuse or Irregular Reflection.

When the surface is very smooth, like polished metal surface, light bounces in a regular
manner. This is called Regular Reflection.

Laws of Reflection
 The angle of incidence, i and the angle reflection, r are equal.
 The incident ray, reflected ray and the normal all, lie in the same plane.

Plane Reflecting Surfaces


Properties of images formed by plane mirrors
 The image and the object are equidistant from the mirror.
 The image is the same size as the object.
 The image is virtual,
 The image is laterally inverted
 The image is upright/erect

Experiment to determine the position of the image formed by a plane mirror.


Apparatus:
 Pin board
 8 pins
 A4 plain paper
 Plane mirror

Procedure:
1. Attach the plain paper to the pin board with 4 pins.
2. Draw a line at the centre of the plane mirror and label it MM’.
3. Place a mirror vertically along the line MM’.
4. Stick a pin O in front of the plane mirror. This is the object pin.
5. With the eye in a suitable position, place two pins in front of the mirror such that
they are in line with image I of the object O seen in the mirror [These pins should
be place as far apart as possible to improve accuracy]. Mark the positions of the
pins P and Q and draw a straight line PQ through their positions.
6. Repeat steps 4 and 5 for pins R and S and line RS.
7. Remove the mirror and pins from the pin board. Extend lines PQ and RS beyond
MM’ until they intersect.
8. The image is formed at the intersection of PQ and RS.

Uses of Plane Mirrors.


1. Cosmetic purposes
2. Periscopes
3. Rear view mirrors in vehicles.
4. Decorations

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