PDF for physics from the official Punjab Board website. Access chapter-wise details for physics with the link to download the ...

The Dutch lens grinder Cornelis Drebbel 2 (1572–1633) had experimented with different lenses — he put them together in a tube and found that the magnification was higher than with only one lens.

A deep analysis of bi- and plano-concave lens made of stacked subwavelength hole arrays in terms of focus and angular power distribution is presented. The key difference between these left-handed ...

A compact augmented reality (AR) combiner using Pancharatnam-Berry phase (PBP) lens and holographic optical element (HOE) is proposed. PBP lens is activated as a convex lens or a concave lens ...

Do you get a headache after staring at your monitor for hours at a time? Blue light glasses might help. Here's how to pick a pair that works best for you, along with some of our favorites.

Macro lenses are built with a specific optical construction that enables the dramatic magnification of small subjects. They're also designed to focus at close distances, helping to throw out the ...

This CPD article explores how the ‘thin’ lens model for magnification can be used in clinical practice using simple equations, informative diagrams and patient examples ...

I.7.4.1 Effectiveness of early lens extraction for the treatment of primary angle closure glaucoma (EAGLE) The EAGLE was a multicentre, randomised, prospective clinical trial designed to compare the ...