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Figure 2.1: Picture of two round mirrors. Adapted from: https://shanghaijingsheng.en.made-in-china.com/product/CwgakeHbrVRc/China-Average-Reflectance-98-Optical-Mirror-Flat-Mirror-Dielectric-Mirror-for-Precision-Optical-Imaging-Instruments.html
What do mirrors do?
What do mirrors do?
Mirrors play a crucial role in optometric instruments by reflecting light. It allows visualisation and manipulation of light paths so that images can be formed how you need it, eg. enlarged. They are used in various instruments to create images, direct light beams, and examine the interior of the eye, for focusing laser beams or for imaging applications.. (Google AI Overview, 2025)
Figure 2.2: From Teachoo on 16 December 2024 on "What is the difference between Real and Virtual image?" Adapted from: https://www.teachoo.com/10844/3122/What-is-the-difference-between-Real-and-Virtual-Image-/category/Extra-Questions/#goog_rewarded
Real or Virtual?
Real or Virtual?
Usually the images formed by a mirror are virtual, for example, images formed by plane mirrors. The images are formed at points where extensions from incident and reflected rays converge behind the mirror, thus being virtual.
Real images may be formed, when the incident and reflected rays intersect in front of the mirror. However, real images that are formed will always be inverted.
The type of image formed depends on the proximity of the object to the mirror! (Evident, n.d.)
Figure 2.3: From Laser Focus World on 17 January 2024 on "Mirror or Lens?: A Simple Guide to the Technical Differences." Adapted from: https://www.laserfocusworld.com/directory/finished-optics-coatings-components/mirrors/blog/14303678/shanghai-optics-inc-mirror-or-lens-a-simple-guide-to-the-technical-differences
What are the types of mirrors?
What are the types of mirrors?
Mirrors can be categorised into different types based on their shape and coating material, each with unique optical properties and applications.
For example, flat mirrors reflect light straight back, while concave mirrors focus light to a point and convex mirrors spread light out. (Done by Anders, no reference)
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