Explain why does an underwater object appears to be situated above its actual position.

Explain why does drinking water kept in an earthern pot cool down ?

Explain why is the sun visible a little before actual sunrise and a little after actual sunset.

Explain why food does not cook speedily at high altitudes.

Explain why a piece of iron appears to be cooler than a piece of wood in winter.

Explain why Iron : Iron reacts with steam, but copper does not.

A simple pendulum with a negatively charged bob is made to oscillate just above a positively charged plate. What happens to its time period?

Explain with diagram ,why a rod when partialy immersed in water appears to be bent.

Why does the sky appear dark instead of blue to an astronaut?