Physics
A piece of paper appears black in sunlight. What will be its colour when seen in red light?
Reflection of Light
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Answer
When seen in red light, the piece of paper will appear black only. This is because the piece of paper absorbs light of all colours therefore it appears black.
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Related Questions
The leaves appear green when seen in white light. Give a reason.
A rose appears red in white light. How will it appear in:
(i) green light,
(ii) red light?
Give a reason for each of your answers.
Why does a piece of paper appear white in sunlight? How would you expect it to appear when viewed in red light?
Meera is in a dance class practicing in front of a flat mirror fixed on a wall. Her teacher draws a line on the floor and asks her to walk 5 steps forward. She notices that her image also seems to walk 5 steps towards her inside the mirror, but her friend sitting on a bench tells her that the image is not actually moving.
Answer the following :
(i) Is Meera's image real or inverted in the mirror?
(ii) What happens to the size of the image when she comes closer to the mirror ?
(iii) If Meera raises her right leg, which leg looks raised in the image ?
(iv) What must a surface have to act as a plane mirror?