1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment, the ratio of intensities of light from one slit to the other is $$9: 1$$. If Im is the maximum intensity, what is the resultant intensity when they interfere at phase difference $$\phi$$ ?

A
$$ \frac{\operatorname{Im}}{9}\left[1+8 \cos ^2\left(\frac{\phi}{2}\right)\right] $$
B
$$ \frac{\operatorname{Im}}{4}\left[1+8 \cos ^2\left(\frac{\phi}{2}\right)\right] $$
C
$$ \frac{\operatorname{Im}}{4}\left[1+3 \cos ^2\left(\frac{\phi}{2}\right)\right] $$
D
$$ \frac{\operatorname{Im}}{2}\left[4+12 \cos ^2\left(\frac{\phi}{2}\right)\right] $$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment, the intensity of light at a point on the screen where the path difference is $$\lambda$$ is $$\mathrm{K}$$ units ($$\lambda$$ is the wavelength of light used). The percentage change in intensity at a point where the path difference is $$\frac{\lambda}{6}$$ and the above point is

A
75%
B
50%
C
4%
D
25%
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the Young's double slit experiment $$n^{\text {th }}$$ bright for red coincides with $$(n+1)^{\text {th }}$$ bright for violet. Then the value of '$$n$$' is: (given: wave length of red light $$=6300^{\circ} \mathrm{A}$$ and wave length of violet $$=4200^{\circ} \mathrm{A}$$).

A
2
B
4
C
3
D
1
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

When light wave passes from a medium of refractive index '$$\mu$$' to another medium of refractive index '$$2 \mu$$' the phase change occurs to the light is :

A
180$$^\circ$$
B
90$$^\circ$$
C
60$$^\circ$$
D
zero
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