A converging lens and a diverging lens are placed as shown, 12 cm apart. The con

Question

A converging lens and a diverging lens are placed as shown, 12 cm apart. The converging lens is located at the origin. An object is located at -50 cm.

Where along the priciple axis is the location of the imagine formed by only the first lens?

Where is the location of the final image due to both lenses? Give your answer along the principle axis show with the origin at the converging lens.

3 A converging lens and a diverging lens are placed as shown in the figure above, 12 cm apart, The converging lens is located at the origin. An object is located at-50 cm. +12 50 a) Whece akong the princplss lo of the image fo a) Where along the principle axis is the location of the image formed by only the first lens 1) -38.2 cm 2) -12.5 cnm 3) +33.3 cm Where is the location of the final image due to both lenses. Give your answer along th principle axis shown above with the origin at the converging lens. 1) -33.3 cm 2) -17.0 cm 3) -6.8 cm 4) +5.6 cm 5) +29.7 cmm An object is held 15 from a lens of focal length fi- 10 cm. A second lens, of focal length f 10 cm, is 20 m away from the first. (Note that the drawing may

Explanation / Answer

a) For the first lens:

1/s+1/s'=1/f

1/50+1/s' = 1/20

s' = 33.3 cm to the right of the first lens so:

x = +33.3 cm

b) In this case the position for the objet for lens 2(imagen formed by lens 1) is

S = 33.3-12= 21.3 cm

we use:

1/S+1/S' = 1/F

1/21.3+1/S'=1/-10

S' = -6.81 cm it means 6.81 cm to the right of the second lens

so the position is:

X = 12+6.81 = 18.81 cm but this is not an choice

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