Figure shows a solid transport semi cylinder of radius 10 cm. A screen is placed at a distance 60 cm from O. A narrow beam is incident along X-axis at O. If cylinder starts rotating about O in clockwise direction with angular speed 6 rad//s spot formed on screen will move upward (Refractive index of material of cylinder=(5)/(3)) What is initial angular velcity of ray refrected from plane surface.

Figure shows a solid transport semi cylinder of radius 10 cm. A screen

1.	Figure shows a solid transport semi cylinder of radius 10 cm. A screen is placed at a distance 60 cm from O. A narrow beam is incident along X-axis at O. If cylinder starts rotating about O in clockwise direction with angular speed 6 rad//s spot formed on screen will move upward (Refractive index of material of cylinder=(5)/(3)) What is initial angular velcity of ray refrected from plane surface.
Answer» `2 rad//s` `10 rad//s` `16 rad//s` `4 rad//s` Solution :Angle of REFRACTED ray from `x`-axis `theta=r-i` For SMALL angles `r=mui` `theta=(mu-1)irArr(d theta)/(DT)=(mu-1)(di)/(dt)=((5)/(3)-1)6=4 rad//s`

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