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Questions  

 A luminous point is moving at speed v0towards a spherical mirror, along its axis. Then the speed at which the image of this point object is moving is given by (with R = radius of curvature and u = object distance)

a
-v0
b
-v0R2u-R
c
-v02u-RR
d
-v0R2u-R2

detailed solution

Correct option is D

1u+1v=1f  differentiatiing -1u2dudt-1v2dvdt= 0 dvdt= -v0v2u2                 dudt = v0    vu=fu-f         f=R/2

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The distance of a real object from the focus of a convex mirror of radius of curvature ‘a’ is ‘b’. Then the distance of the image from the focus is


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