1
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should be (1 light year = 9.46 $$\times$$ 1015 m) of the order of :
A
106 km
B
108 km
C
1011 km
D
1010 km
2
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
3
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
4
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
In Young’s double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light of 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is $${{{1^o}} \over {60}}$$, the value of d0 is close to :
A
1 mm
B
2 mm
C
4 mm
D
3 mm
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