Name the part in human eye having light sensitive cells.

Question

(i) Name the part in human eye having light sensitive cells.
(ii) Mention the reason for twinkling of stars. Draw a diagram to illustrate it.

Answer 1

(i) Retina has light sensitive cells
(ii) Twinkling of stars is due to refraction of light. Light from the star undergoes refraction continuously, and get bend in random directions. Apparent position of star is slightly different from its actual position. This changes continuously to change in refractive index.