00:01
What question says that? so one technique to measure an angle.
00:03
So we are measuring the angle theta, that we are measuring.
00:07
So we are talking about technique, which is the angle of prism.
00:11
Here we need to find angle of prism that we want to find here.
00:17
And there's a technique we are talking about which is still the figure.
00:20
The parallel beam, parallel beam of light, gehex of the prism.
00:25
So we are talking about parallel beam, parallel beam of light, parallel beam.
00:32
Of light direct to apex of the prism direct to apex of prism and here we can write the b which is equal to a here b which is equal to 2a here b which is equal to 2a here and now we're talking about prism so let's draw the figure this is the a now we're talking about b so suppose here straight line here there's another line here we have another line and there's a one line straight so here we can write suppose 9 is here so we can draw here dot a line and here we have dot a line.
01:11
So this is the point we can call as a b...