Question

An optical technician mounts two thin lenses along a single optical axis (the lenses are at right angles to the line connecting them, and they appear concentric when viewed from either end). The lenses are identical, each with a positive (converging) focal length of +15.2 cm. They are separated by a distance of 40.4 cm. Lens 1 is to the left of Lens 2.

In order to evaluate the lens combination as a single optical instrument, the technician places an object 30.0 cm in front of (to the left of) Lens 1.

(a)

What is the final image's distance (in cm) from Lens 2? (Omit any sign that may result from your calculation.)

cm

(b)

Where is the final image located?

behind (to the right of) Lens 2 between Lens 1 and Lens 2     in front of (to the left of) Lens 1

(c)

What is the overall magnification of the lens pair, considered as a single optical instrument?

Answer 1