Variation Lens 1 Lens 2 1 Converging Converging p 1 < |f 1 | 2 Converging Conver

Question

Variation

Lens 1

Lens 2

1

Converging

Converging

p1 < |f1|

2

Converging

Converging

p1 > |f1|

3

Diverging

Converging

p1 < |f1|

4

Diverging

Converging

p1 >|f1|

5

Diverging

Diverging

p1 < |f1|

6

Diverging

Diverging

p1 > |f1|

For which variations can we tell, without calculation, whether the final image (that due to lens 2) is to the left or right of lens 2 and whether it has the same orientation as the object?

The table details six variations of the basic arrangement of two thin lenses represented in the figure. (The points labeled F1 and F2 are the focal points of lenses 1 and 2.) An object is distance p1 to the left of lens 1, as in Fig. 34.18.

Variation

Lens 1

Lens 2

1

Converging

Converging

p1 < |f1|

2

Converging

Converging

p1 > |f1|

3

Diverging

Converging

p1 < |f1|

4

Diverging

Converging

p1 >|f1|

5

Diverging

Diverging

p1 < |f1|

6

Diverging

Diverging

p1 > |f1|

Explanation / Answer

Unlike converging lenses, diverging lenses always produce images that are o the same side of the lens, are virtual and upright..so for variations 5 and 6 this is always fulfilled and calculations are not needed

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