Sudarshan always sleeps at night with the lights on, as he is scared of the dark. One night, Sudarshan was sleeping in his room when there was a power failure due to thunderstorm. Darkness, as well as disturbance due to thunders, woke him. On waking, Sudarshan could not see anything. He was terrified and removed the window curtains only to see no light outside, except a few infrequent streaks of lightning. He called his friend Rohan home and both of them sat and started talking. As they were talking, the power came back. Why was Sudarshan unable to see in the absence of a light source? What are unrealistic fears and how should we avoid them?
Important Questions on Light
Follow the clues and solve the terms you have learned.
Across:
1. The transparent front part of the eye, which covers and protects it.
3. A ray of light or other radiation falling on or striking a surface.
4. A layer at the back of the eye where the lens focuses the light.
6. Nerve cells in the retina that transmit sensations to the brain.
7. A small opening in the iris through which light enters the eye.
8. The rod-shaped cells in the retina, which are sensitive to dim light.
Down:
2. The interchanging of left and right in an image.
5. A small area on the retina containing no sensory cells where the optic nerve passes through the retina.
