Friday, June 20, 2008

Reflection of Light by 2E3 Syafiq

I learnt the definition of reflection, the law of reflection, the characteristic of the image formed in a mirror, the different types of reflection, the uses of plain mirrors and curved mirrors and drawing the reflection of diagram during physics lessons.

Definition of reflection: When light rays bounce off the mirror and travel to your eyes.

The law of reflection: The angle of incidence is equal to the angle of reflection.

The characteristic of the image formed in a mirror:

  1. The image formed in a plane mirror is virtual, laterally inverted, upright, same size as the object and the image lies far behind the mirror as the object is in front of the mirror.

The different types of reflection:

( Regular reflection )

When a parallel beam of light hits a smooth surface such as a plane mirror, it is reflected as a parallel beam.

( Diffuse reflection ) When a beam of light hits a rough surface, the individual rays are reflected in different direction and no image is formed.

Uses of plane mirror: It helps the driver to see traffic behind the car, it make a room look bigger and to check the person appearance.

Uses of curved mirror:

(Convex mirror) Convex mirrors form upright images that are always smaller than the object. (e.g. security mirrors are used in shop)

(Concave mirror) Concave mirrors form upright magnified images if the object is close to the mirror. If the object is further away, the image is inverted. (e.g. tool used by dentist)


Resources: and Science Discovery Science textbook 2.

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