Question

8. (a) State primary colours and formation of
secondary colours by colour addition.
(b) Define colour subtraction. Describe
appearance of colour of an object based on
reflection and absorption.​

Answer 1

Answer:

a) Combining light of two primary colours produces the secondary colours – cyan, magenta and yellow. Combining light of all three primary colours produces white light. Combining different colours of light is known as additive mixing

b) The process of color subtraction is a useful means of predicting the ultimate color appearance of an object if the color of the incident light and the pigments are known. By using the complementary color scheme, the colors of light that will be absorbed by a given material can be determined.

Answer 2

Archimedes' principle is named after Archimedes of Syracuse, who first discovered this law in 212 BC.[4] For objects, floating and sunken, and in gases as well as liquids (i.e. a fluid), Archimedes' principle may be stated thus in terms of forces:

Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object

—with the clarifications that for a sunken object the volume of displaced fluid is the volume of the object, and for a floating object on a liquid, the weight of the displaced liquid is the weight of the object.[5]

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