1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
In an experiment a convex lens of focal length 15 cm is placed coaxially on an optical bench in front of a convex mirror at a distance of 5 cm from it. It is found that an object and its image coincide, if the object is placed at a distance of 20 cm from the lens. The focal length of the convex mirror is :
A
27.5 cm
B
20.0 cm
C
25.0 cm
D
30.5 cm
2
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+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
$${\tan ^{ - 1}}\,\left( {\sin {\theta _C}} \right)$$
3
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+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.
4
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+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
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