1.

If prism angle \[\alpha =1{}^\circ ,\ \mu =1.54,\]distance between screen and prism \[(b)=0.7\,m,\] distance between prism and source \[a=0.3\,m,\ \lambda =180\pi \ nm\] then in Fresnal biprism find the value of \[\beta \] (fringe width)                                                                       [RPMT 2002]

A. \[{{10}^{-4}}m\]
B. \[{{10}^{-3}}mm\]
C. \[{{10}^{-4}}\times \pi m\]
D. \[\pi \times {{10}^{-3}}m\]
Answer» B. \[{{10}^{-3}}mm\]


Discussion

No Comment Found

Related MCQs