JEE Main 2021 (Online) 26th February Morning Shift | Ray & Wave Optics Question 117 | Physics

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-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 :

Image is real, same side of convex mirror.

Image is virtual, opposite side of convex mirror.

Image is virtual, opposite side of concave mirror.

Image is real, same side of concave mirror.

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-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 :

0.50 mm

0.25 mm

1 mm

0.75 mm

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-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:

its size increases, but intensity decreases

its size increases, and intensity increases

its size decreases, but intensity increases

its sizes decreases, and intensity decreases

JEE Main 2021 (Online) 25th February Morning Slot

MCQ (Single Correct Answer)

-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 :

$${{2\sqrt {2x} } \over {2x + 1}}$$

$${{2\sqrt {2x} } \over {x + 1}}$$

$${{\sqrt {2x} } \over {x + 1}}$$

$${{\sqrt {2x} } \over {2x + 1}}$$

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