1
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
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
B
C
D
2
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
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 :
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
$${{n\lambda } \over {\left( {\mu - 1} \right)}}$$
3
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
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
B
C
D
4
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
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
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