#  Geometrical Optics; Light Rays and Reflections 

 



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### Ray Vector Block

\[S | t | —\]   
A model of the incident and reflected rays w.r.t. the normal.

### Blackboard Optics

\[L | t | ★★★\]  
Mobile ray-tracing kit to demonstrate basic geometrical optics.   
  
\[[In-Depth Description](/presentations/blackboard-optics)\]

### Optics Disk

\[M | t | ★★★\]  
Angles of incidence, reflection, and refraction clearly demonstrated.  
  
\[[In-Depth Description](/presentations/optics-disk)\]

### Electronic Pinhole Camera

\[M | t+ | ★★★\]  
TV camera with lens replaced by pinhole in foil.  
  
\[[In-Depth Description](/presentations/electronic-pinhole-camera)\]

### Inverse Pinhole Camera

\[L | t++ | —\]   
A pinhole "projector" to demonstrate various aspects of image formation.

### Inverse Square Law

\[M | t+ | —\]  
Use a photographic light meter to show inverse square relation of light intensity (larger version also available).  
  
 \[[In-Depth Description](/presentations/inverse-square-law)\]

### Hero's Shortest Path

\[M | t+ | ★★\]  
A string and pulley model to demonstrate Hero's explanation of why the angles of reflection and incidence are equal.   
  
\[[In-Depth Description](/presentations/heros-shortest-path)\]

### Glass Transmission/Reflection

\[S | t++ | —\]   
Glass Transmission/Reflection. Show the percentage of transmitted and reflected light.

### Pepper's Ghost

\[M | t+ | ★★★\]   
Recreate Prof John Pepper's 1863 illusion that even had Michael Faraday baffled.

### Spherical Mirror Imaging

\[L | t++ | —\]  
Produce real and virtual images with a large mirror.  
  
\[[In-Depth Description](/presentations/spherical-mirror-imaging)\]

### Mirage Mirror

\[S | t+ | —\]  
Dual spherical mirrors produce a mirage.

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu