A physics event on light
Light, taken apart.
A day of optics for the curious: prisms, lenses, lasers and interference. Live workshops and hands-on experiments that pull white light into its colours.
01About
λ 420–470 nm · indigo
Newton put a prism in a sunbeam and found that white was never one colour. It was all of them, travelling together. SPECTRUM is a day of doing that again, with your own hands: bending light, splitting it, trapping it in glass and reading what it says.
02Live workshops
λ 470–500 nm · cyan
Small rooms, real kit, no slides. Every workshop is included with your ticket. Seats go first come, first served at the door.
Start here: the spectroscope you build in the first hour is what you’ll use to read every light source for the rest of the day.
Cut a slit, mount a grating and point it at street lights, then read which elements are glowing.
Find focal lengths by hand, build a telescope from two lenses and see why the image flips.
Trap a laser in a stream of water, then in a fibre. Total internal reflection, and the internet, explained.
Crossed polarisers turn a plastic ruler into a rainbow map of the stress locked inside it.
Turn a box into a camera, expose paper in sunlight and develop it on the spot.
03Experiments
λ 500–565 nm · green
These are the same equations the workshops use. Drag a slider, bend a beam, cross two polarisers. Every number here is calculated live, not animated.
EXP 01
Light slows down in glass and bends. Go the other way, from glass into air, and past one angle it can't get out at all.
n1 sin θ1 = n2 sin θ2
EXP 02
Glass slows violet more than red, so each colour bends by a different amount. Flint glass spreads the fan wider than crown.
n(λ) = A + B / λ2
EXP 03
Send one colour through two narrow slits. The light that lands on the screen is a pattern of bright and dark bands, not two lines. That's what waves do.
Δy = λL / d
EXP 04
Thousands of tiny slits per millimetre sort light by wavelength, and red lands furthest out. This is the heart of every spectroscope.
d sin θ = mλ
EXP 05
A polariser only lets through light vibrating one way. Cross two of them and the light fades to nothing, at exactly 90°.
I = I0 cos2θ
EXP 06
Red light waves are almost twice as long as violet ones. Shorter waves wiggle faster and each photon carries more energy.
λ = c / f · E = hf
04Gallery
λ 565–590 nm · yellow
Every beam, every prism, every face lit up by a spectrum.
Gallery locked
Photos from SPECTRUM 3.0 go up here after the event on 26 Oct.
05Tickets & pricing
λ 590–625 nm · orange
Students get in free through their academy. Everyone else books online in two minutes, and the ticket arrives by email.
Students
Free
For enrolled students. Admits the student and one parent, and each can enter separately.
Admits 1
₹100incl. taxes
Workshop Experience. Admits one.
Prices in Indian rupees. Payments are processed securely by Razorpay (UPI, cards, netbanking). Refunds are available up to 72 hours before the event. See Cancellation & Refunds.
06Venue
λ 625–700 nm · red
Rabindra Bhavan
Barrackpore Trunk Road, Nutan Pally
Surya Sen Nagar
Khardaha, West Bengal 700117
Doors 10:15 IST · 22.7255° N, 88.3738° E
07FAQ
λ 700–750 nm · red
Something else? Write to us. We reply within two days.
Anyone curious about light: students, parents, teachers, hobbyists. No physics background needed. Every workshop starts from zero.
Your academy registers you and we email your ticket, which admits you plus one parent. Can't find it? Use Find my ticket with the email your academy has on record.
Yes. Your ticket has two entries: one for you and one for your parent. Each can be scanned on its own, at different times.
No. Show the QR on your phone, or on paper if you prefer. Turn your screen brightness up at the gate.
Yes, with every ticket. Seats are first come, first served at each room. Arrive five minutes early.
Yes, up to 72 hours before the event. See Cancellation & Refunds for the details.
All lasers are Class 2 or lower and run by our team. Children under 12 must be with an adult.
