1
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1

In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5 $$\times$$ 10$$-$$2 m towards the slits, the change in fringe width is 3 $$\times$$ 10$$-$$3 cm. If the distance between the slits is 1 mm, then the wavelength of the light will be ____________ nm.

2
JEE Main 2022 (Online) 29th June Morning Shift
Numerical
+4
-1

A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 30 cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is _____________ mm.

3
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1

In a Young's double slit experiment, an angular width of the fringe is 0.35$$^\circ$$ on a screen placed at 2 m away for particular wavelength of 450 nm. The angular width of the fringe, when whole system is immersed in a medium of refractive index 7/5, is $${1 \over \alpha }$$. The value of $$\alpha$$ is ___________.

4
JEE Main 2022 (Online) 27th June Morning Shift
Numerical
+4
-1

In Young's double slit experiment the two slits are 0.6 mm distance apart. Interference pattern is observed on a screen at a distance 80 cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light will be ____________ nm.

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