The slits in Young's double-slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringe is I₀. If one of the slits is closed, the intensity at this point will be:

1. I₀

2. I₀ / 4

3. I₀ / 2

4. 4I₀

A thin mica sheet of thickness 2×10^–6 m and refractive index (μ = 1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift 

(1) 2 fringes upward

(2) 2 fringes downward

(3) 10 fringes upward

(4) None of these

In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be 

(1) 54

(2) 64

(3) 74

(4) 84

In Young's double slit experiment, the angular width of fringe is 0.20^o for sodium light of wavelength 5890 Å.  The angular width of fringe, if the complete system is dipped in water, will be:

1. 0.11^o

2. 0.15^o

3. 0.22^o

4. 0.30^o

In Young's double slit experiment, the distance between the two slits is 0.1 mm and the wavelength of light used is 4×10^–7 m. If the width of the fringe on the screen is 4 mm, the distance between screen and slit is 

(1) 0.1 mm

(2) 1 cm

(3) 0.1 cm

(4) 1 m

In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen 

(1) 62

(2) 67

(3) 85

(4) 99

In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light 

(1) 5000 Å

(2) 6000 Å

(3) 7000 Å

(4) 9000 Å

If a transparent medium of refractive index μ = 1.5 and thickness t = 2.5 × 10^–5 m is inserted in front of one of the slits of Young’s Double Slit experiment, how much will be the shift in the interference pattern? The distance between the slits is 0.5 mm and that between slits and screen is 100 cm 

1. 5 cm

2. 2.5 cm

3. 0.25 cm

4. 0.1 cm

In Young’s experiment, monochromatic light is used to illuminate the two slits A and B. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit 

(1) The fringes will disappear

(2) The fringe width will increase

(3) The fringe width will decrease

(4) There will be no change in the fringe width but the pattern shifts

Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits 

(1) 0.12 mm

(2) 0.3 mm

(3) 3.0 mm

(4) 4.0 mm