Wave Optics Part 2

Concept:Angular separation in Young's double slit experiment depends only on slit spacing and wavelength, not on screen distance.Explanation:The angular separation $\theta$ is given by $\theta = \frac{\lambda}{d}$.Here, $\lambda$ is the wavelength of light and $d$ is the separation between slits.Changing the screen distance does not affect $\theta$ because $\theta$ is angle, not fringe width.So, Statement I is false.If $\lambda$ increases, $\theta = \frac{\lambda}{d}$ also increases.Thus, replacing with a higher wavelength source increases angular separation.Hence, Statement II is true.Answer:Statement I is false, Statement II is true. Correct option is C.