1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
A parallel beam of light of wavelength $$\lambda $$ is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpenficular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is
A
2$$\pi $$
B
3$$\pi $$
C
4$$\pi $$
D
$$\pi $$$$\lambda $$
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
The reddish appearance of the sun at sunrise and sunset is due to
A
the scattering of light
B
the polarisation of light
C
the colour of the sun
D
the colour of the sky
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths $${\lambda _1}$$ = 12000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 10000 $$\mathop A\limits^ \circ $$. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?
A
4 mm
B
3 m
C
8 mm
D
6 mm
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
The frequency of a light wave in a material is 2 $$ \times $$ 1014 Hz and wavelength is 5000 $$\mathop A\limits^ \circ $$. The refractive index of material will be
A
1.50
B
3.00
C
1.33
D
1.40
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