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Q.

The reflecting surface is represented by the equation 2x=y2 as shown in figure. A ray travelling horizontal becomes vertical after reflection. The co-ordinates of the point incidence can be

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a

1,1/2

b

1/2,1/2

c

1/2,1

d

1/2,-1

answer is A, D.

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Detailed Solution

At the point if incidence slope should be ±1

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y2=2x y=2x dydx=2.12x=12x=1 2x=1     2x=1        x=12y=±1           12,±1

 

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