391st one
well, the central fringe would be white
1.A young's double slit expt is performed with white light,then
A)The central fringe will be white
B)There will not be a completely dark fringe
C)The fringe next to the central will be red
D)The fringe next to the central will be violet
(multiple correct options)
2.A point object O is placed on the principal axis of a convex lens of f=20cm at a distance of 40cm to the left of it .The diameter of the lens is 10cm.An eye is placed 60cm to the right,at a distance h below the axis,find the max value of h to see the image
3.Distance between screen and object = 40 cm,if a converging lens is placed in between,there is no image on the screen for all posns of the lens,then
A)f<20cm
B)f>20cm
C)f≤20cm
D)f≥10cm
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15 Answers
1@ amrita .. though skygirl was much more intelligent ..
q2.) if f=20cm, then how is it possible dat diameter=10cm ???!!!
he is talking about the diameter of the apperture !
1@IITgoer aarthi ....λ for violet is least and λ for red is largest . .so violet will be next to the central fringe