A beam of diameter 'd' is incident on a ...

A beam of diameter 'd' is incident on a glass hemisphere as shown. If the radius of curvature of the hemisphere is very large in comparison to d, then the diameter of the beam at the base of the hemisphere will be

`(3)/(4)d`

distance between object and screen is 90 cm

`(d)/(3)`

`(2)/(3)d`

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