1
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index μ is put in front of one of the slits, the central maximum gest shifted by a distance equal to n fringe widths. If the wavelength of light used is $$\lambda $$, t will be : JEE Main 2019 (Online) 9th April Morning Slot Physics - Wave Optics Question 89 English
A
$${{D\lambda } \over {a\left( {\mu - 1} \right)}}$$
B
$${{2nD\lambda } \over {a\left( {\mu - 1} \right)}}$$
C
$${{2D\lambda } \over {a\left( {\mu - 1} \right)}}$$
D
$${{n\lambda } \over {\left( {\mu - 1} \right)}}$$
2
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star :-
A
610 × 10–9 radian
B
457.5 × 10–9 radian
C
305 × 10–9 radian
D
152.5 × 10–9 radian
3
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In an interference experiment the ratio of amplitudes of coherent waves is $${{{a_1}} \over {{a_2}}} = {1 \over 3}$$ . The ratio of maximum and minimum intensities of fringes will be :
A
2
B
4
C
18
D
9
4
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In a double-slit experiment, green light (5303$$\mathop A\limits^ \circ $$) falls on a double slit having a separation of 19.44 $$\mu $$m and awidht of 4.05 $$\mu $$m. The number of bright fringes between the first and the second diffraction minima is :
A
04
B
05
C
10
D
09
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