In optical arrangement with graduated scale, when glass block is tilted by ‘i’ then incident ray from scale deviates from straight line path. What is the displacement ‘h’? ( w is the glass width)

In optical arrangement with graduated scale, when glass block is tilt

1.	In optical arrangement with graduated scale, when glass block is tilted by ‘i’ then incident ray from scale deviates from straight line path. What is the displacement ‘h’? ( w is the glass width)
A.	sin(i-r)/wcosr
B.	w cos(i-r)/sinr
C.	w sin(i-r)/cosr
D.	cos(i-r)/wsinr
Answer» D. cos(i-r)/wsinr

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In optical arrangement with graduated scale, when glass block is tilted by ‘i’ then incident ray from scale deviates from straight line path. What is the displacement ‘h’? ( w is the glass width)

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