She looked at the camera, as if trying to find an answer in the lens.

If using lenses, you may have to allow for energy lost in the lens.

When I took a second picture, his full face was in the lens.

The degree of correction in the lens didn't seem that great to her.

These two cases are examples of image formation in lenses.

I put my eye to the peephole and saw two people standing close together so they would show up well in the lens.

This reduced complexity in the camera body and the lens.

However, you are correct that how matter in the lens is distributed will determine what we see.

He could see his tiny distorted reflection in the lens.

Herschel's music led him to an interest in mathematics and lenses.