Physics · Challenge

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Lens powerRunning
Optics bench. Focal length at 0.828 m. Power × focal length 2.07 , Unity 1 . Currently power × focal length is over by 1.07.TUNINGOBJECTCONVEX LENSFOCAL PLANE
t = 0.0s

Power × focal length

2.07

Unity

1

0.828 m

Optics bench. Focal length at 0.828 m. Power × focal length 2.07 , Unity 1 . Currently power × focal length is over by 1.07.

What has to balanceP=1fP = \frac{1}{f}

What is happening

You take control of an optician grinding a reading lens to a written prescription.

A trial frame shows the text still blurred. The prescription calls for 2.5 dioptres, and the blank has been cut to the wrong focal length.