Solved: "If the focus of a concave lens is..."

High School
Physics
Light and Optics
Refraction of light

Dashawn Clark

Answered question

2022-05-02

If the focus of a concave lens is a virtual point, how can a ray appear to come from there? In other words, how can we view the image there?

Answer & Explanation

jeffster830gyz

Beginner2022-05-03Added 21 answers

The rays which the eyes detect have been refracted in such a way that they spread out in the real space of the lens, but our brains (in a way that is common to all situations of refraction) interpret the rays as having travelled in a straight line even as they pass through the lens. Thus, they seem to have originated at a point in virtual space, and the brain believes that the object is located at this point, rather than where it actually is. This is true of all images, and explains why the virtual image is seen, as a sort of optical illusion.

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