The five sense organs are Eyes ,ears , nose, tongue and skin. Among these the most important one are the eyes. It is one of the most valuable and sensitive organs .It helps us to identify colours. This allows us to see the beautiful world around us.

5. Myopic eye
Correction using concave lens

6. Hypermetropic eye
Correction using convex lens

8. Incident ray
Refracted ray
Emergent ray
D
i
r
Air Glass Glass Air
Glass prism
e Angle of emergence
Angle of deviation
Normal

9. Beam of white light
Spectrum
R
O
Y
G
I
B
V
Glass prism

11. R
V
V
R R
VWhite light
White light
Glass prisms

12. Sunlight
Raindrop
Red Violet
Refraction and dispersion
Internal reflection
Observer
Refraction

14. Apparent position
Real position
Eye
Star
Increasing
refractive index
of atmosphere

18. Earth
Observer
SunriseSunset
Apparent positionApparent position
Atmosphere
Horizon Horizon
Real position Real position

23. Observer
Sun near horizon
Sun overhead
Blue light scattered away
Sun appears reddish
Atmosphere
Earth