1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width
A
is halved
B
becomes four times
C
remains unchanged
D
is doubled
2
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
$$\pi $$$$\lambda $$
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle, $$\theta $$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $$\theta $$ is
A
45o
B
30o
C
55o
D
50o
4
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
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