1
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
Let the refractive index of a denser medium with respect to a rarer medium be n12 and its critical angle be θC . At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is 90o. Angle A is given by :
A
$${1 \over {{{\cos }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$
B
$${1 \over {{{\tan }^{ - 1}}\left( {\sin {\theta _C}} \right)}}$$
C
$${\cos ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$
D
$${\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$
2
JEE Main 2017 (Offline)
+4
-1
A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15cm from a converging lens of magnitude of focal length 20cm. A beam of parallel light falls on the diverging lens. The final image formed is:
A
real and at a distance of 6 cm from the convergent lens.
B
real and at a distance of 40 cm from convergent lens.
C
virtual and at a distance of 40 cm from convergent lens.
D
real and at a distance of 40 cm from the divergent lens.
3
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :
A
Two
B
Three
C
Four
D
Five
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface. A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :

A
14 cm below flat surface
B
30 cm below flat surface
C
20 cm below flat surface
D
16 cm below flat surface
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