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A coplanar beam of ligth emerging from a point source has the equation lambdax-y+2(1+alambda)-0, lambda in R.The rays of the beam strike an elliptical surface and get reflected. The reflected rays form another convergent beam having eqution mux-y+2(1-mu)=0, mu in R. Further, it is found that the foot of the perpendicular from the point (2,2) upon any tangent to the ellipse lies on the circle x^(2)+y^(2)-4y-5=0 The total distance travelled by an incident ray starting at one focus and the correcponding reflected ray terminating at another focus is |
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Answer» 9 |
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