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