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

Not only does Sigma's f/1.8 APS-C zoom make prime lenses redundant – it might actually make full-frame redundant ...

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 ...

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 ...