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

Incident light of wavelength $$\lambda=800 \mathrm{~nm}$$ produces a diffraction pattern on a screen $$1.5 \mathrm{~m}$$ away when it passes through a single slit of width $$0.5 \mathrm{~mm}$$. The distance between the first dark fringes on either side of the central bright fringe is

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

The width of the fringes obtained in the Young's double slit experiment is $$2.6 \mathrm{~mm}$$ when light of wave length $$6000^{\circ} \mathrm{A}$$ is used. If the whole apparatus is immersed in a liquid of refractive index 1.3 the new fringe width will be :

A
2.6 mm
B
5.2 mm
C
2 mm
D
4 mm
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