its 40
I just took the test right now to get this answer
Answer:
okay.. Questions?????????
Explanation:
It is given that,
The time period of artificial satellite in a circular orbit of radius R is T. The relation between the time period and the radius is given by :

The radius of the orbit in which time period is 8T is R'. So, the relation is given by :



So, the radius of the orbit in which time period is 8T is 4R. Hence, this is the required solution.
Condenser Lens - This lens system is located immediately under the stage and focuses the light on the specimen.