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

A monochromatic light of wavelength $$800 \mathrm{~nm}$$ is incident normally on a single slit of width $$0.020 \mathrm{~mm}$$ to produce a diffraction pattern on a screen placed $$1 \mathrm{~m}$$ away. Estimate the number of fringes obtained in Young's double slit experiment with slit separation $$0.20 \mathrm{~mm}$$, which can be accommodated within the range of total angular spread of the central maximum due to single slit.

A
25
B
30
C
20
D
15
2
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
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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