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The ray from a laser pointer hits a plan...

The ray from a laser pointer hits a plane mirror and the reflected ray strikes a screen. How far away from point X should the ray strike the mirror to cause the reflected ray to hit point R?

A

6 cm

B

12 cm

C

16 cm

D

18 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Let x be the distance of point at which ray strikes
`DeltaXAY` and `DeltaSAR` are similar triangles, (AAA)
`therefore(XY)/(XA)=(SR)/(SA)`
or `8/x=4/(24-x)` or x=16cm
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