1
JEE Advanced 2014 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
A light source, width emits two wavelengths $$\lambda$$1 = 400 nm and $$\lambda$$2 = 600 nm, is used in a Young's double-slit experiment. If recorded fringe widths for $$\lambda$$1 and $$\lambda$$2 are $$\beta$$1 and $$\beta$$2 and the number of fringes for them within a distance y on one side of the central maximum are m1 and m2, respectively, then
A
$$\beta$$2 > $$\beta$$1
B
m1 > m2
C
from the central maximum, 3rd maximum of $$\lambda$$2 overlaps with 5th minimum of $$\lambda$$1
D
the angular separation of fringes of $$\lambda$$1 is greater than $$\lambda$$2
2
IIT-JEE 2008 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2

In a Young's double slit experiment, the separation between the two slits is d and the wavelength of the light is $$\lambda$$. The intensity of light falling on slit 1 is four times the intensity of light falling on slit 2. Choose the correct choice(s).

A
If $$d=\lambda$$, the screen will contain only one maximum
B
If $$\lambda < d < 2\lambda$$, at least one more maximum (besides the central maximum) will be observed on the screen
C
If the intensity of light falling on slit 1 is reduced so that it becomes equal to that of slit 2, the intensities of the observed dark and bright fringes will increase
D
If the intensity of light falling on slit 2 is increased so that it becomes equal to that of slit 1, the intensities of the observed dark and bright fringes will increase
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