1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The interference pattern is obtained with two coherent light sources of intensity ratio $9: 1$. The ratio of $\frac{I_{\operatorname{MAX}}+I_{\operatorname{MIN}}}{I_{\operatorname{MAX}}-I_{\operatorname{MIN}}}$ is $\frac{\alpha}{\beta}$. The values of $\alpha$ and $\beta$ are:
A
5 and 3
B
3 and 1
C
1 and 9
D
9 and 1
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The wavelength of a monochromatic light which is used in single slit diffraction is 800 nm . The width of the single slit for which the first minimum appears at $\theta=45^{\circ}$ on the screen will be:
A
$1.13 \mu \mathrm{~m}$
B
$1.23 \mu \mathrm{~m}$
C
$2.13 \mu \mathrm{~m}$
D
$1.3 \mu \mathrm{~m}$
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
Young's double slit experiment is first done in air and then in a medium of refractive index $\mu$. If the 7 th dark fringe in the medium lies where the 4 th bright fringe is in air, then the value of $\mu$ is :
A
1.654
B
1.389
C
1.875
D
1.768
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
An EM wave of frequency $5 \times 10^9 \mathrm{~Hz}$ falls normally on a rectangular slit of width 3 cm . What is the total angular width of the central maxima?
A
8 rad
B
2 rad
C
4 rad
D
0.25 rad
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