Question:
What type of color is observed when a compound absorbs red coloured light?
What type of color is observed when a compound absorbs red coloured light?
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The colour seen is the complementary colour of the light absorbed, and the complement of red is green.
Updated On: Oct 1, 2026
- Red
- Blue
- Green
- Yellow
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
A coloured compound shows the colour that is left over after it takes some light out of white light. The colour we see is the complementary colour of the light that is absorbed.
Step 2: Key Formula or Approach:
Complementary colours sit opposite each other on the colour wheel. The pairs are red and green, blue and orange, yellow and violet.
Step 3: Detailed Explanation:
The compound absorbs red light, so red is removed from the white light that falls on it.
The light that passes through or reflects back is white minus red, which looks green.
So the compound looks green to the eye.
Red is wrong because that is the colour absorbed, not the colour seen. Blue and yellow are not opposite red on the wheel, so they are not the complementary colour.
Final Answer:
The observed colour is green, option (C). \[ \boxed{\text{(C) Green}} \]
A coloured compound shows the colour that is left over after it takes some light out of white light. The colour we see is the complementary colour of the light that is absorbed.
Step 2: Key Formula or Approach:
Complementary colours sit opposite each other on the colour wheel. The pairs are red and green, blue and orange, yellow and violet.
Step 3: Detailed Explanation:
The compound absorbs red light, so red is removed from the white light that falls on it.
The light that passes through or reflects back is white minus red, which looks green.
So the compound looks green to the eye.
Red is wrong because that is the colour absorbed, not the colour seen. Blue and yellow are not opposite red on the wheel, so they are not the complementary colour.
Final Answer:
The observed colour is green, option (C). \[ \boxed{\text{(C) Green}} \]
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