1
MHT CET 2023 10th May Evening Shift
+1
-0

In Young's double slit experiment, the two slits are 'd' distance apart. Interference pattern is observed on a screen at a distance 'D' from the slits. A dark fringe is observed on a screen directly opposite to one of the slits. The wavelength of light is

A
$$\frac{\mathrm{D}^2}{2 \mathrm{~d}}$$
B
$$\frac{\mathrm{d}^2}{2 \mathrm{D}}$$
C
$$\frac{\mathrm{D}^2}{\mathrm{~d}}$$
D
$$\frac{d^2}{D}$$
2
MHT CET 2023 10th May Evening Shift
+1
-0

A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern

A
increases with increase of slit width.
B
decreases with increase of slit width.
C
decreases with decrease of slit width.
D
may increase or decrease with decrease of slit width.
3
MHT CET 2023 10th May Evening Shift
+1
-0

Light waves from two coherent sources arrive at two points on a screen with path difference of zero and $$\frac{\lambda^{\prime}}{2}$$. The ratio of intensities at the points is $$\left(\cos 0^{\circ}=1, \cos \pi=-1\right)$$

A
$$2: 1$$
B
$$1: 1$$
C
$$1: 2$$
D
$$\infty: 1$$
4
MHT CET 2023 10th May Morning Shift
+1
-0

A person is observing a bacteria through a compound microscope. For better observation and to improve its resolving power he should

A
increase the wavelength of light.
B
increase the refractive index of the medium between the object and objective lens.
C
decrease the focal length of the eyepiece.
D
decrease the diameter of the objective lens.
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