1
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 $$\mathop A\limits^o $$ is used, the minimum separation between two points, to be seen as distinct, will be :
A
0.12 $$\mu $$m
B
0.38 $$\mu $$m
C
0.24 $$\mu $$m
D
0.48 $$\mu $$m
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In a Young's double slit experiment, the ratio of the slit's width is 4 : 1. The ratio of the intensity of maxima to minima, close to the central fringe on the screen, will be :
A
25 : 9
B
4 : 1
C
$${\left( {\sqrt 3 + 1} \right)^4}:16$$
D
9 : 1
3
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600nm. coming from a distant object, the limit of resolution of the telescope is close to :-
A
3.0 × 10–7 rad
B
4.5 × 10–7 rad
C
1.5 × 10–7 rad
D
2.0 × 10–7 rad
4
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 117 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
$${{n\lambda } \over {\left( {\mu - 1} \right)}}$$
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