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songoku
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Homework Statement
Two thin lenses are placed 5 cm apart along the same axis and illuminated with a beam of light parallel to that axis, The first lens in the path of the beam is a converging lens of focal length 10 cm whereas the second is a diverging lens of focal length 5 cm. If the second lens is now moved towards the first, the emergent light
a. changes from parallel to divergent
b. changes from divergent to parallel
c. changes from parallel to convergent
d. changes from convergent to parallel
e. changes from convergent to divergent
Homework Equations
not sure
The Attempt at a Solution
I tried drawing the sketch but I don't see the pattern corresponding to the choices given. When passing through converging lens, the light will be focused on focal plane, then when passing through diverging lens, the light will diverge from focal point of the diverging lens.
When diverging lens is moved closer, the light will still undergo same process, focused at first then diverged from focal point of diverging lens. Maybe I can say that from my sketch I get the emergent light does not change (from divergent and still divergent)...
Thanks