Question

10. In Young's double slit experiment with monochromatic light and slit separation of 1.2mm, the fringes
are obtained on a screen placed at some distance from the slits. If the screen is moved by 5cm towards
the slits, the change in fringe width is 20 Em. Calculate the wavelength of the light used. (A) [ 480 nm)
11. A parallel beam of light of wavelength 625 nm falls on a narrow slit and the resulting diffraction
pattern is observed on a screen 80 cm away. It is observed that the first minimum is at a distance of 2.5
rom from the center of the screen. Find the (i) width of the slit (ii) angular width of central maximum.(iii)
linear width of central maximum.(A) [(i) 0.2 mm (ii)0.00625 rad (iii) 5mm)
12.A candle is held 6 cm away from​

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