The focal length of field lens is 4.5 cm. Then the equivalent focal length of a Huygens eyepiece is:
1.5 cm
2.5 cm
2.25 cm
3 cm

1.5 cm

3 cm

2.25 cm

2.5 cm

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The focal length of field lens is 4.5 cm. Then the equivalent focal length of a Huygens eyepiece is:1.5 cm2.5 cm2.25 cm3 cm