JEE Main 2021 (Online) 25th February Evening Shift | Wave Optics Question 72 | Physics

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 Shift

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 :

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

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

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

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

JEE Main 2021 (Online) 24th February Evening Shift

MCQ (Single Correct Answer)

-1

If the source of light used in a Young's double slit experiment is changed from red to violet :

the fringes will become brighter.

the intensity of minima will increase.

consecutive fringe lines will come closer.

the central bright fringe will become a dark fringe.

JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

4 : 1

2 : 1

1 : 4

3 : 1

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