CBSE Class 12-science Answered
please help
Asked by arpitarout132 | 29 Apr, 2022, 01:12: AM
Expert Answer
Figure shows a glass cube of edge 5 cm is placed on a point source so that the point source is act centre of bottom surface of cube.
As shown in figure , when light incident on side surface , total internal reflection takes place when angle of incidence exceeds the critical angle C.
Hence light will not come out of surface above the point where total internal reflection takes place .
We need to cover the area below the point where total internal reflection is taking place to block the light coming out of surface.
Critical angle C is given as , sin (C) = 1/μg = 1/√2
where μg is refractive index of glass
we get C = 45o . Hence total internal reflection starts at half of height of cube i.e 2.5 cm at the side of face .
Hence minimum area to be covered = 4 × ( 2.5 × 5 ) = 50 cm2
Answered by Thiyagarajan K | 29 Apr, 2022, 09:39: AM
Concept Videos
-
Total internal reflection and its applications ...
This video is based on Total internal reflection, phenomena explained by to... -
Total Internal Reflection - Part 2
This video explains theory of total internal reflection and also explains i... -
Total Internal Reflection
Total internal reflection. Phenomena explained by total internal reflectio...
CBSE 12-science - Physics
Asked by gazanfarali5782 | 09 Jan, 2023, 03:21: PM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by arpitarout132 | 29 Apr, 2022, 01:12: AM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by csword674 | 25 Oct, 2021, 03:10: PM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by varghesemc100 | 21 Feb, 2019, 11:06: AM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by Topperlearning User | 21 May, 2014, 08:54: AM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by Topperlearning User | 21 May, 2014, 09:08: AM
ANSWERED BY EXPERTCBSE 12-science - Physics
Asked by Topperlearning User | 21 May, 2014, 09:16: AM
ANSWERED BY EXPERTCBSE 12-science - Physics
Why or how does a diamond sparkle more than a transparent material like glass cut out in same shape?
Asked by Topperlearning User | 21 May, 2014, 09:37: AM
ANSWERED BY EXPERT
