Q21 of 117 Page 10

Draw the colour circle showing primary and composite colours.

Red, blue and green are the primary colours. The other colours which are obtained by using these primary colours are called secondary colours.

More from this chapter

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19 A stamp collector uses a lens (convex) of focal length 7 cm, to examine a stamp. What is the power of the lens? 20 What is critical angle? Draw a ray diagram showing light incident at the critical angle. 22 What is meant by dispersion of light? 23 How are focal length and radius of curvature connected?