1
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value | f | = 40 cm. The image of object produced by the mirror is of height 25 cm and has the same orientation of the object. One may conclude from the information :
A
Image is real, same side of convex mirror.
B
Image is virtual, opposite side of convex mirror.
C
Image is virtual, opposite side of concave mirror.
D
Image is real, same side of concave mirror.
2
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be :
A
0.50 mm
B
0.25 mm
C
1 mm
D
0.75 mm
3
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 $$\mu$$m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that:
A
its size increases, but intensity decreases
B
its size increases, and intensity increases
C
its size decreases, but intensity increases
D
its sizes decreases, and intensity decreases
4
JEE Main 2021 (Online) 25th February Morning Slot
+4
-1
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $${{{I_{\max }} - {I_{\min }}} \over {{I_{\max }} + {I_{\min }}}}$$ will be :
A
$${{2\sqrt {2x} } \over {2x + 1}}$$
B
$${{2\sqrt {2x} } \over {x + 1}}$$
C
$${{\sqrt {2x} } \over {x + 1}}$$
D
$${{\sqrt {2x} } \over {2x + 1}}$$
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