1
MHT CET 2021 23th September Morning Shift
+1
-0

In the interference experiment using a biprism, the distance of the slits from the screen is increased by $$25 \%$$ and the separation between the slits is halved. If '$$W$$' represents the original fringewidth, the new fringewidth is

A
2 W
B
2.5 W
C
4 W
D
1.5 W
2
MHT CET 2021 23th September Morning Shift
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-0

In biprims experiment, the $$4^{\text {th }}$$ dark band is formed opposite to one of the slits. The wavelength of light used is $$(\mathrm{d}=$$ distance between the slits, $$\mathrm{D}=$$ distance between scource and the screen)

A
$$\frac{\mathrm{d}^2}{14 \mathrm{D}}$$
B
$$\mathrm{\frac{d^2}{7 D}}$$
C
$$\frac{d^2}{9 \mathrm{D}}$$
D
$$\frac{d^2}{11 \mathrm{D}}$$
3
MHT CET 2021 22th September Evening Shift
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In Young's double slit experiment using monochromatic light of wavelength '$$\lambda$$', the maximum intensity of light at a point on the screen is $$\mathrm{K}$$ units. The intensity of light at point where the path difference is $$\frac{\lambda}{3}$$ is

$$\left[\cos 60^{\circ}=\sin 30^{\circ}=\frac{1}{2}\right]$$

A
$$\frac{K}{4}$$
B
$$\frac{3 K}{4}$$
C
K
D
$$\frac{\mathrm{K}}{2}$$
4
MHT CET 2021 22th September Evening Shift
+1
-0

If two sources emit light waves of different amplitudes then

A
brightness of fringes is less.
B
fringes disappear after short time.
C
fringe width is less.
D
there is some intensity of light in the region of destructive interference.
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