ulike model test paper 4 solutions

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At a point the angle of elevation ofvthe pole is such that it's tangent is5/2.On moving 240m towords the pole, the tangent to the angle of elevation becomes 3/4. Find the height of the pole.
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for the same angle of incidence of 45 degree, the refraction angle in three transparent media a,b,c are 25 degree,30 degree,35 degree respactively . in which medium is the speedof light minimum and in which medium maximum???
 
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Model Test paper4

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