Physics
Why does a piece of paper appear white in sunlight? How would you expect it to appear when viewed in red light?
Reflection of Light
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Answer
A piece of paper appears white in sunlight because it reflects light of all the colours. When the paper is viewed in red light it appears red colour because it reflects the red light falling on it.
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The leaves appear green when seen in white light. Give a reason.
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(i) green light,
(ii) red light?
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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.
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(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?