| Vaishali fell asleep under a tree at time P and woke up at Q (as shown). |
| She is wondering why she cannot see her shadow. Select the correct explanation for this. |
| 1. At time 'P', the tree is blocking the light and preventing it from falling on her. |
| 2. At time 'Q', her shadow falls at the back, so she cannot see her shadow. |
| 3. She fell asleep in the morning and woke up in the evening. |
| 4. She is reflecting back sunlight. |
A) 1 and 2 only
B) 1 and 4 only
C) 2 and 3 only
D) 3 and 4 only
Correct Answer: A
Solution :
A shadow is formed when an opaque (non-transparent) object falls in the way of light rays and light rays get blocked. At time 'P', the tree is blocking all the light so tree's shadow is being formed but as no light is falling on Vaishali so her shadow is not being formed. At time 'Q' the sunlight is falling on her and her shadow is being formed on the tree trunk just behind her so she cannot see her shadow. Tree's shadow is being formed on tree's backside.
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