• ### IB Physics Imaging option: Magnification of optical instruments

Take note of sign conventions!

## Magnifying glasses

A single convex lens can be used as a magnifying glass.

If an object $O$ is placed within the focal point $F$ of a convex lens, a virtual image $I$ will be formed.

The linear magnification $m$ of… »

• ### Thoughts on Black Mirror S03E04 ‘San Junipero’

‘San Junipero’ is, without a doubt, one of the most unique episodes of Black Mirror in all its three seasons. Unlike the other episodes, which are primarily straightforward one-sided criticisms of particular aspects of technology and society, ‘San Junipero’ deals with deeper, more thoughtful questions… »

• ### Decentralised open-source self-hosted encrypted cloud services

A number of years ago, after reflecting on how dependent I was on Google's cloud services, I began to migrate to open-source self-hosted solutions, primarily through ownCloud. After a recent server outage left me without service for a substantial period, however, I began the search… »

## Symptoms

Services like systemd-journald and systemd-logind show a failed state with error code 228/SECCOMP, and return an error message when attempted to be started using systemctl. This also caused journald logs to not be created or updated for any services.

## Problem

The problem on my… »

• ### An even smarterer html_truncate tag for Jekyll

As you know, I am using Jekyll to generate this blog. When setting mine up I read how Benjamin Thomas read how Jack Moffitt set up his Jekyll installation, and thought the idea of an html_truncate filter was pretty cool, and thought the… »

• ### Mini vMac with colour (on Linux)

As I posted some time ago, Mini vMac now supports colour display when emulating a Macintosh II. As I discovered today, however, this isn't as simple as it seems, and many links have gone dead since I last tried, so here are my notes… »