Questions about the Lenses poster

What’s on the Lenses poster?

The rule, 3 worked examples, and the mistake everyone makes. The reciprocal of the focal length equals the sum of the reciprocals of object and im…; 1/f = 1/u + 1/v · m = v/u; Converging lens, object beyond 2f = Real, inverted, diminished; Object inside f = Virtual, upright, magnified; Diverging lens = Always virtual, upright, diminished; Common mistake: Ignoring signs → Applying the convention consistently. Power in dioptres is 1/f with f in metres. A +2 D lens has a focal length of 0.5 m.

Who is the Lenses poster for?

Lenses belongs to the Physics section rather than to a school year, because physical science is not something one grade owns. Anyone learning waves & optics can pin it up — a beginner, a student mid-course, or someone revising years later.

When should you use the Lenses poster?

Real is positive. Virtual is negative. Get the convention right and the algebra follows. A wall chart earns its place by being glanceable from where the work is happening, so Lenses belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.

What other posters go with Lenses?

Diffraction Gratings, The Doppler Effect and Optical Instruments sit alongside Lenses in the Physics section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Diffraction GratingsThe Doppler EffectOptical Instruments

Is the Lenses poster free to download and print?

Yes. Lenses downloads as a free PDF with no account, no email and no watermark, like everything else in the Physics section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence

What size does the Lenses poster print at?

Lenses is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Lenses loses nothing.Printing guide