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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
He must direct the beam vertically upwards
b
He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection
c
He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for total internal reflection
answer is C.
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