0:00
Hello everyone.
00:01
So in a given question that is talking about a magnifying glass.
00:06
Okay, so magnifying glass and magnify lens, so both are the same.
00:11
So in that situation guys, first of all we put a given data.
00:15
The focal length of that magnifying glass is considered a plus of a 10 centimeter and the image will be formed with the sign that is a minus of a 30 centimeter.
00:27
Okay.
00:28
Now we use a length.
00:30
Lens formula.
00:32
So lens formula is equivalent to 1 upon f is equivalent to a 1 upon f is equivalent to a 1 upon v minus 1 upon u.
00:43
1 by 1 we put the holder values 1 upon 10 is equivalent to 1 upon 13 and minus of 1 upon u.
00:52
If we are just moving a 1 upon you in that side so it becomes a positive and minus 1 upon and the minus of 1 by 10 both are a negative so 1 upon u is equivalent to just take the lcm of a 30 this is a minus 1 and it is cancelled out the 3 times so that is a minus 3 so we get a minus of 4 by 30 so a student this is the value over 1 by u so we can mention 1 by u is equivalent to a minus of 4 by 30 this is equivalent to a minus of 4 by 30 this is equivalent to a minus of a 2 upon 15.
01:31
Just reciprocal that quantity...