| The distance L2 Dτ and the focal length F2[1] of the lens L2 shall be so chosen that the image of Dτ completely covers the receiver R. | a0c0 |
| The distance L2 Dτ and the focal length F2[1] of the lens L2 shall be so chosen that the image of Dτ completely covers the receiver R. | a0c0 |