Question

Object Lens Point A near f ar a. Between the object and the near focal point. Between the near focal point and point A. c. Between point A and the lens. d. Between lens and the far focal point. rFurther from the lens than the far focal point. 8. Three experiments involving thin soap film (in air) are shown below. Which of these three experiments will produce constructive interference as seen by the observer (i.e. the eye)? The index of refraction of the soap film is 1.25 and there is air above the soap film. In Experiments I and III there is air below the soap film but in Experiment II there is glass (with index of refraction of 1.5) below the soap film. In all three experiments, the incident light is nearly normal to the surface and has a wavelength of 250 nm in air. Note that the film thickness in each experiment is written on each diagram Experiment I Experiment II Experiment III Incident Light eye Incident Light eye Incident Light Air Air Air Soap t 350 n Soa 250 nm Soap :t= 100 n Air Air ass Experiment I only Experiment Ⅱ only c. Experiment Ⅲ only d. Experiments I and Ⅲ only e. None of these three experiments will have constructive interference as seen by the observer. 8.19

The answer is C, but how?

Answer 1

Experimet 2. Saap o, ,2,3 Experiment-T 2 soap No, Co러yhuthwe inler krene experimeud -TI o Pion-C