Question

Consider the setup of the two-lens system shown in the figure, where the separation of the two lenses is denoted by d focal lengths are respectively fi 2 a. An object is placed at a distance 2 a to the left of lens # 1 1.5 a. Their = a and f2 а #1 #2 d 1.5a P1 2a

Determine the magnification if lens #2 were absent; i.e., the magnification of lens #1.

1. M1 = 1.5

2. M1 = 0.5

3. M1 = 2.5

4. M1 = −0.5

5. M1 = −2.5

6. M1 = 1

7. M1 = −2

8. M1 = −1.5

9. M1 = 2

10. M1 = −1

Determine the properties of the final image for the present two-lens problem.

1. real, enlarged and inverted

2. virtual, enlarged and upright

3. virtual, reduced and inverted

4. virtual, enlarged and inverted

5. real, reduced and upright

6. real, enlarged and upright

7. real, reduced and inverted

8. virtual, reduced and upright

Answer 1

solution For lens #1 ai - do = Į di = do t / = di = =ga tao ² dia ga = ga to magnification = My = document And correct option is =- 10- M = -1 For lens #2 The image of Lens #1, acts as the Object cep. Lens #2 object distance - Da-lis@=01a . (It is a virtual object) so from the ho = d = osa + 2a = Site di = his = 0.40 so magnification from lens #2 = M2 My = hea = 0.8 Total magnification = mi X M2 = -1 8 or8 so Properties al final image is - 7 real, reduced and inverted. 2 tour 2а Joº • 2.5 sa ce