Answers
The amount of light passing through a system of two polarizers can be quantitatively described by applying Malu's cosine squared law.
I = I0*
2.
...........(1)
Where , I =intensity of light passing through the analyzer (total amount of light),
I0 = the intensity of light that is incident upon the polarizer
= angle between the transmission axes of the polarizer and analyzer
from question , 0.15 I0 = I
put the value of equation ....(1)
COS= 
(I / I0)= 
0.15=0.387
(0.387)=
=67.21 degree
the angle between the polarizers is 67.21 degree
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