By Shapley H.

**Read or Download A Note on the Simple Device for Increasing a Photographic Power of Large Telescopes (1920)(en)(4s) PDF**

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**Additional info for A Note on the Simple Device for Increasing a Photographic Power of Large Telescopes (1920)(en)(4s)**

**Example text**

The Aperture Stop To understand the aperture stop, let us first consider the simple case depicted in Fig. 1. 1) under paraxial approximation and for the object distancle u. 2) and as D2 > D1 , the image in the second case will be brighter. Thus, we see 34 I. Geometrical Optics I ~al I I (0) D2 I (b) I I I I I I I I I 1______ l·u/2- I I-ur----:: (c) I I -3u- 4" -u- (d) Fig. 1. Aperture stop for optical systems. that in this simple case the size of the lenses determines the aperture stopand the second lens has a larger aperture stop.

The image formation using ray tracing is also shown in Fig. 4. 5. The Telescoping System If M21 = 0, then the equivalent thin-lens formulation that we have discussed earlier does not hold good. These systems are called telescopic systems. 3. As shown in Fig. 2) The last equality is obtained by noting that the determinant of the M matrix is 1. ~------z-------. System (M) • ,~ f-------z --~ ----1 Fig. 1. A telescopic system. 30 I. 5) An important quantity for the telescopic system is the longitudinal magnification.

When the optical energy is incident on a surface we define the radiant incidence (N) to denote the incident power per unit area. Note that the element of area, dA, must be perpendicular to the direction of the light propagation. Otherwise, a cos (J factor must be included if the normal to the area is not parallel to the direction of the light propagation. This is shown in Fig. 1. Using vector notation, where the element of area, dA, is represented by a vector having magnitude dA, and direction along its normal, then we obtain the incident power to be given by P = f.

### A Note on the Simple Device for Increasing a Photographic Power of Large Telescopes (1920)(en)(4s) by Shapley H.

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