00:01
The question says that a 10 centimeter high object is placed at a distance of 30 cm from a convex length of focal length 10 cm.
00:11
Find the position of image.
00:13
So this is a convex lens is given and the height of the object is also mentioned.
00:19
So we will write down the information that are given.
00:23
So focal length is given 10 cm and for convex lens focal length is positive.
00:29
Due to the sign convention.
00:32
Next, the object distance is given 30 centimetre and we consider the object distance negative in case of convex lens, right? so now by applying the lens formula, we can easily find out the image distance.
00:48
So what is the lens formula? now see, according to the lens formula, according to the lens formula, 1 by f is equal to 1 by v minus 1 by u now f is positive so it will be 1 by 10 okay we have to find out v and u u is negative so it will be 1 by minus 30 so it's 1 by plus 1 by v plus 1 by 30 right so how to find out 1 by v so 1 by v will be equal to 1 by 10 minus 1 by 30.
01:29
So 30 will be the lcm and it's coming 2 by 30.
01:33
Okay.
01:34
So 1 by v is coming 2 by 30.
01:38
So it's 1 by 15 and v is 15 centimeter...