1
NEET 2019
+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
2
NEET 2018
+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
3
NEET 2018
+4
-1
Unpolarised light is incident from air on a plane surface of a material of refractive index $$\mu$$. At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
A
Reflected light is polarised with its electric vector parallel to the plane of incidence
B
Reflected light is polarised with its electric vector perpendicular to the plane of incidence
C
$$i = {\sin ^{ - 1}}\left( {{1 \over \mu }} \right)$$
D
i = tan-1$$\left( {{1 \over \mu }} \right)$$
4
NEET 2017
+4
-1
The ratio of resolving powers of an optical microscope for two wavelength $$\lambda$$1 = 4000 $$\mathop A\limits^ \circ$$ and $${\lambda _2}$$ = 6000 $$\mathop A\limits^ \circ$$ is
A
9 : 4
B
3 : 2
C
16 : 81
D
8 : 27
EXAM MAP
Medical
NEET