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The figure shows Billet split lens method to produce interference pattern on the screen. In this figure ‘S’ is a monochromatic point source emitting light of wavelength l = 500 nm. A thin lens of circular shape and focal length 0.10 m is cut into two identical halves L1 and L2 by a plane passing through a diameter. The two halves are placed symmetrically about the central axis SO with a gap of 0.5 mm. The distance along the axis from S to L1 and L2 is 0.15m, while that from L1 and L2 to O is 1.30 m. The screen at O is normal to SO. If the gap between the two lenses O1O2 is reduced to half its initial value, then the fringe width of the interference pattern |
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Answer» The figure shows Billet split lens method to produce interference pattern on the screen. In this figure ‘S’ is a monochromatic point source emitting light of wavelength l = 500 nm. A thin lens of circular shape and focal length 0.10 m is cut into two identical halves L1 and L2 by a plane passing through a diameter. The two halves are placed symmetrically about the central axis SO with a gap of 0.5 mm. The distance along the axis from S to L1 and L2 is 0.15m, while that from L1 and L2 to O is 1.30 m. The screen at O is normal to SO. |
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