00:01
Hi, here in this given problem there are multiple questions out of which i will be solving only the few.
00:09
The first one which is question number 3, it says absolute refractive index for the fused glass quartz, it was not given, we have found it with the help of net and that comes out to be equal to 1 .472.
00:49
Angle of refraction within the fused glass quartz that is given as r is equal to 28 degree and we have to find angle of incidence.
01:06
So using snell's law, n is equal to sin i by sin r, means 1 .472 is equal to, angle of incidence is missing, we have to find it, so this is sin i and sin 28 degree, so sin i will be 1 .472 into sin 28 degree which is calculated to be equal to 0 .691.
01:48
So this angle of incidence will be given by sin inverse of 0 .691 means this i is equal to 43 .7 degree.
02:02
Answer for this question number 3 over here.
02:06
Then in another question that is question number 4, focal length of concave lens that is given as minus 32 centimeter, object distance towards left of this lens p that is minus 22 centimeter for the concave lens.
02:49
So in order to find image distance using lens equation which is a relation among the image distance q, object distance p and focal length f.
03:09
So plugging in the known values 1 by q minus p minus 22 centimeter is equal to f minus 32.
03:21
So this 1 by q will be given by minus 1 by 32 minus 1 by 22, means this is lcm is 32 into 22 and in numerator this is minus 22 minus 32.
03:40
So q means the image distance calculated to be equal to minus 13 .04 centimeter.
03:52
Answer for the fourth problem, fourth question.
03:58
This is one of the answer we have to find linear magnification also and that is given as the ratio of the image distance to that of object distance.
04:21
So this is minus 13 .04 minus 22 means m comes out to be equal to means linear magnification plus 0 .6 as the image is upright...