A circular disc is placed in front of a narrow source. When the point of observation is 2 m from the disc, then it covers first HPZ. The intensity at this point is I . When the point of observation is 25 cm from the disc then intensity will be

A circular disc is placed in front of a narrow source. When the point

1.	A circular disc is placed in front of a narrow source. When the point of observation is 2 m from the disc, then it covers first HPZ. The intensity at this point is I . When the point of observation is 25 cm from the disc then intensity will be
Answer» `((R_(6))/(R_(2)))^(2)I` `((R_(7))/(R_(2)))^(2)I` `((R_(8))/(R_(2)))^(2)I` `((R_(9))/(R_(2)))^(2)I` ANSWER :D

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A circular disc is placed in front of a narrow source. When the point of observation is 2 m from the disc, then it covers first HPZ. The intensity at this point is I . When the point of observation is 25 cm from the disc then intensity will be

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