is incident on a glass slab 1 54 in a direction as shown in

Last updated: 6/21/2023

is incident on a glass slab 1 54 in a direction as shown in figure The reflected ray OB is pass through a Nicol prism On viewing through a Nicole prism we find on rotating the prism that A 33 O N 33 B 1 The intensity is reduced down to zero and remains zero 2 The intensity is reduced down some what and rises again 3 There is no change in intensity 4 The intensity gradually reduces to zero and then again increases