Engraving depicting a concave mirror. The diagram showing the virtual focus when the light source is inside the principal focus. Dated 19th Century

• Contributor: World History Archive / Alamy Stock Photo
• Image ID: KJ1J7D
• File size: 180 MB (6.8 MB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 7395 x 8508 px | 62.6 x 72 cm | 24.7 x 28.4 inches | 300dpi
• Date taken: 4 July 2017
• Photographer: World History Archive

More information

This image could have imperfections as it’s either historical or reportage.

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• 19th century
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