wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A point source of light S is placed at the bottom of a vessel containing a liquid of refracting index 5/3. A person is viewing the source from above the surface. there is an opaque disc of radius 2 cm floating on the surface of the liquid such that the center of the disc is vertically above the source S. The liquid from the vessel is gradually drained out through a tap. The maximum height of the liquid for which the source cannot be seen from above is
1046167_308d28ef6bbb4a50b1863d35a0072e39.png

A
1.33 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
2.66 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
3.99 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
0.33 m
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 1.33 cm
Sin C=rr2+h2
r = radius of the disk
h = Height of the liquid for both the source can't be seen
SinC=1μ
1μ=rr2+h2
by simplification
h=rμ21

h=(53)21

h=43cm=1.33cm

Hence (A) option is correct

flag
Suggest Corrections
thumbs-up
0
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Total Internal Reflection
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon