0:00
Hi.
00:02
In the given problem, the diameter of the moon, the real moon, which will serve as the height of the object, is given as 3 .5 into 10 dash to the part 3 km.
00:23
And the distance of the moon from the earth, which will serve as the distance of the object from the mirror, is given as 3 .8 into 10 reach to the par 5 kilometer, which is almost infinite.
00:58
This much distance can be taken as infinite distance.
01:03
A focal length of this concave mirror has been given as plus 16 .9 meter.
01:10
So in comparison to this distance, this focal length which is in meter, the distance of the moon, which is in kilometer can be taken as infinite.
01:21
Hence, as the object means moon is at infinite, its image should be formed at the focus of concave mirror.
02:00
Hence, in the first part of the problem, the distance of the image means skew should be exactly equal to the focal length or we can say this is plus 16 .9 meter...