1
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :
A
1.83 $$\times$$ 10-7 rad
B
7.32 $$\times$$ 10-7 rad
C
6.00 $$\times$$ 10-7 rad
D
3.66 $$\times$$ 10-7 rad
2
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :
A
half
B
four times
C
one-fourth
D
double
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2o. What will be the angular width of the first minima, ($$\mu$$water = 4/3) if the entire experimental apparatus is immersed in water?
A
0.15o
B
0.05o
C
0.1o
D
0.266o
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength $$\lambda$$ of the light used is 5896 $$\mathop A\limits^0$$ and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20o. To increase the fringe angular width to 0.21o (with same $$\lambda$$ and D) the separation between the slits needs to be changed to
A
1.9 mm
B
1.8 mm
C
2.1 mm
D
1.7 mm
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