Reading the curve
How much light passes through as a polarizer turns?
Calculate how transmitted light changes as a polarizer turns.
Open investigationCLASS 12 STUDENT · INDIA
Phalin
Thakkar
Exploring physics. Sharing what I learn.
I'm a Class 12 student in India interested in light, measurement, and quantum physics. Alongside my research, I help Class 12 students living in orphanages prepare for JEE physics and mathematics. This site brings together my investigations, interactive models, and explanations.
POLARIZATION READOUTIDEAL MODEL
α = 0°≈ 0.6378
α = 45°≈ 0.9806
α = 90°≈ 0.3622
α = 135°≈ 0.0194
How it works
Iα / Iref = cos²(α − φ)
q = I0° − I90° · u = I45° − I135°
φ = ½ atan2(u, q) × 180/π, normalised to [0°, 180°).
OPTICS COLLECTION
Light, Measured
How much can we learn about light by measuring what passes through a filter? These four investigations approach that question through calculations, simulations, and interactive models.
The third filter
Can adding a filter let more light through?
Find out why adding a filter between two crossed polarizers can let light through.
Open investigationFinding the hidden direction
Can brightness readings reveal an unknown direction?
Use four brightness readings to recover the direction of linear polarization.
Open investigationMeasurement and messages
What does a measurement choice do to information?
Explore how measurement choices affect a simple quantum communication model.
Open investigationTEACHING & COMMUNITY
Teaching physics and mathematics
Alongside my own studies, I help Class 12 students living in orphanages prepare for JEE physics and mathematics. Explore worked explanations in both subjects, with diagrams, intermediate steps, and practice questions.
PHYSICS
From a force diagram to an equation
Explore how the direction of a force determines its components, then use the diagram to work out an acceleration.
FNmg
MATHEMATICSUnderstanding the graph before solving the inequality
See how roots divide a number line into intervals, and why the sign changes between them.
INTERACTIVE LAB
Change one variable. Watch the model respond.
The first and final polarizers stay at 0° and 90°. Rotate the middle axis and compare the intermediate and final intensity.
AFTER MIDDLE / Iref≈ 50.00%
AFTER FINAL / Iref≈ 25.00%
Iref is the intensity immediately after the first 0° polarizer. For unpolarized light before it, all displayed values gain an additional factor of ½.
Expected final values: 0° → 0%, 30° → 18.75%, 45° → 25%, 60° → 18.75%, 90° → 0%.