WB JEE 2019 | Wave Optics Question 13 | Physics

When the frequency of the light used is changed from $$4 \times {10^{14}}{s^{ - 1}}$$ to $$5 \times {10^{14}}{s^{ - 1}}$$, the angular width of the principal (central) maximum in a single slit Fraunhoffer diffraction pattern changes by 0.6 radian. What is the width of the slit (assume that the experiment is performed in vacuum)?

$$1.5 \times {10^{ - 7}}$$ m

$$3 \times {10^{ - 7}}$$ m

$$5 \times {10^{ - 7}}$$ m

$$6 \times {10^{ - 7}}$$ m

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

If Young's double slit experiment is done with white light, which of the following statements will be true?

All the bright fringes will be coloured.

All the bright fringes will be white.

The central fringe will be white.

No stable interference pattern will be visible.

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

Two monochromatic coherent light beams A and B have intensities L and $${{L \over 4}}$$, respectively. If these beams are superposed, the maximum and minimum intensities will be

$${{{9L} \over 4},{L \over 4}}$$

$${{{5L} \over 4}}$$ , 0

$${{{5L} \over 2}}$$ , 0

2L, $${{L \over 2}}$$

WB JEE 2016

MCQ (Single Correct Answer)

-0.5

For Fraunhoffer diffraction to occur

Light source should be at infinity

Both source and screen should be at infinity

Only the source should be at finite distance

Both source and screen should be at finite distance

Questions Asked from MCQ (Single Correct Answer)

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