1
MHT CET 2023 11th May Evening Shift
+1
-0

In Young's double slit experiment, green light is incident on two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the observed fringes to be more closely spaced?

A
Reducing the separation between the slits
B
Using blue light instead of green light
C
Using red light instead of green light
D
Moving the screen away from the slits
2
MHT CET 2023 11th May Morning Shift
+1
-0

A double slit experiment is immersed in water of refractive index 1.33. The slit separation is $$1 \mathrm{~mm}$$, distance between slit and screen is $$1.33 \mathrm{~m}$$ The slits are illuminated by a light of wavelength $$6300 \mathop A\limits^o$$. The fringe width is

A
$$4.9 \times 10^{-4} \mathrm{~m}$$
B
$$5.8 \times 10^{-4} \mathrm{~m}$$
C
$$6.3 \times 10^{-4} \mathrm{~m}$$
D
$$8.6 \times 10^{-4} \mathrm{~m}$$
3
MHT CET 2023 11th May Morning Shift
+1
-0

In the experiment of diffraction due to a single slit, if the slit width is decreased, the width of the central maximum

A
becomes zero.
B
does not change.
C
increases.
D
decreases.
4
MHT CET 2023 11th May Morning Shift
+1
-0

In biprism experiment, if $$5^{\text {th }}$$ bright band with wavelength $$\lambda_1^{\prime}$$ coincides with $$6^{\text {th }}$$ dark band with wavelength $$\lambda_2{ }^{\prime}$$ then the ratio $$\left(\frac{\lambda_2}{\lambda_1}\right)$$ is

A
$$\frac{9}{7}$$
B
$$\frac{7}{9}$$
C
$$\frac{10}{11}$$
D
$$\frac{11}{10}$$
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