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Questions on colour

Q9.

(a) Lucy looks at a blue object through a green filter.

(i) What colour will the blue object seem to be when viewed through the green filter?

Black

[1 mark]

(ii) Explain why this is the case.

The blue object absorbs all light but blue light. It reflects blue light.

The green filter absorbs blue light - therefore no light from the object gets through the filter to Lucy's eyes and the object looks black.

[2 marks]

(b) She then looks at the blue object through a magenta filter.

(i) What colour does the object appear to be now?

The object looks blue.

[1 mark]

(ii) Explain why this is the case.

The blue object absorbs all light but blue light. It reflects blue light.

The magenta transmits blue and red light - therefore the blue light gets through the filter to Lucy's eyes and the object looks blue.

 

[2 marks]

Maximum 6 marks