YASH CLASSES
THE HUMAN
EYE AND THE COLOURFUL
WORLD
1.Why is normal eye not be able to see
clearly the objects placed closer than
25 cm ?
2. Why do stars are twinkle ?
3.What is colour blindness? what kind
of retinal cells are lacking in persons
suffering from this defect ?
4. What is astigmatism ? what causes
astigmatism ? How is astigmatism.
5. How does atmospheric refraction
affect sunrise and sunset ?
6. what is dispersion of light ? what is
the causes of dispersion ?
7. What is tyndall effect ? What is its
cause ? Name two phenomena
observed in daily life which are based
on tyndall
effect .
8. How does the colour of the scattered
light
depend
on the size
of the
colloidal particles ?
9. Why is the colour of clear sky blue ?
Explain .