7.0 LIGHT, COLOUR AND SIGHT

7.1 The formation of images by plane mirrors and lenses7.2 The formation of images by optical instruments7.3 Light dispersion7.4 Light scattering7.5 The addition and subtraction of coloured light7.6 The appearance of coloured objects7.7 the effect of mixing pigments 7.8 The importance of colour in daily life7.9 Appreciating the benefits of various types of optical instuments to mankind

7.1 Formation o images by a plane mirror and lenses.

The characteristics of the image formed:1. Virtual 2. Laterally inverted

(sonsang sisi)3. Size of images formed is

same as the object4. The distance between

image formed and object is same

A) formation of images by a plane mirror

B) formation of images by of convex lens and concave lens

Images formed by concave(cekung)lens

The characteristics of the image formed:1. Virtual 2. Erect(tegak)3. Diminished(mengecil)

Images formed by convex(cembung) lens

The characteristics of the image formed for near object:1. Virtual 2. Erect(tegak)3. Magnified (membesar)

The characteristics of the image formed for distant object :1. Real2. Inverted(sonsang)3. Diminished(mengecil)

B) Optic terms

Object distance-distance between the object and the lensImage distance-distance between the image and the lens Optical centre-point at the centre of lensPrinciple axis-straight line that passes through the optical centre and is perpendicular to the lensFocal point- is the point where a light ray parallel to the principle axis focuses on after passing through the lens.

Steps for Drawing Ray Diagrams

Lets practice!!