Practicing Success
If a thin film of thickness t and refractive index $μ$ is placed in the path of light coming from a source S, then increase in length of optical path is |
$μ\, t$ $μ / t$ $(μ-1) t$ None of these |
$(μ-1) t$ |
Increase in optical path = $μt-t=(μ-1)t$ |