1. A converging lens is used to focus parallel beams of red light and then later used to focus parallel beams of green light. Which focal length is longer? Explain
2. A photographer moves closer to his subject & then refocuses the camera. Is the camera lens now closer to or further from the film? Explain
The Attempt at a Solution
I want to say red for the first one. I'm guessing that from snells law green light will converge quicker since it has a higher index of refraction than red light?
For the 2nd one I want to say further...Since the camera is closer the light coming in converges faster so the new focal point will be further away from the film?