opticsman
Industrial
- Jun 4, 2002
- 58
Hi
Can any one suggest a cheap and portable monochromatic source for demonstrating Newton fringes ( or similar interference fringes ) . green light is ideal but a green laser is ruled out becuase of cost ( target under $40 ) . I could use a narrow band filter plus torch ( flashlight ) but it will not be efficient becuase it will lose a lot of light. Are there any narrow (ish) green light flashlights around LED or other? Hopefully available in the UK ? any other suggestions are welcome.
thank you in advance . Opticsman.
Can any one suggest a cheap and portable monochromatic source for demonstrating Newton fringes ( or similar interference fringes ) . green light is ideal but a green laser is ruled out becuase of cost ( target under $40 ) . I could use a narrow band filter plus torch ( flashlight ) but it will not be efficient becuase it will lose a lot of light. Are there any narrow (ish) green light flashlights around LED or other? Hopefully available in the UK ? any other suggestions are welcome.
thank you in advance . Opticsman.