Aim:
To Observe light rays through the convex and concave lenses.
To determine the focal length of a converging lens.
Takeaways:
Light rays parallel to the principal axis converge to a point (Principal Focus) after refraction. (Convex lens)
The parallel light rays diverge when they pass through a concave lens.
Covering half the lens would not affect the image size provided that the light ray passing through the optical centre is not blocked.
The thicker the converging lens, the shorter its focal length.
2P12: Converging Lenses
Aim: To observe an image produced by a converging lens
What I have learnt?
THE L.O.S.T. acronym.
L ocation
O rientation
S ize
T ype
The image distance is inversely proportionate compared to object distance.
This means an increase in object distance would result in a decrease in the image distance.
Above is the equation for finding the focal length of a lens.
Aim: To study the quality of water samples in HCI
Knowledge obtained:
Water is needed for many life processes (Photosynthesis, respiration). Without water, life cease to exist.
How is water being purified?
 |
| Sedimentation |
 |
| Filtration |
 |
| Biofiltration |
2P14: Biotic Factor--Lichens
Aim: To determine the effect of light intensity on the density of lichens on a tree trunk
I have learnt that:
Light intensity does indeed affect the growth of Lichens.
The higher the light intensity the more the lichens proliferate.
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