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  4. Two light emitting sources of wavelength 500 nm are separated by a distance 2.2 x 102 cm. A detector can be moved on the line S1S2 is perpendicular to S1S2 as shown in figure below. The minimum and maximum path difference at the detector as it is moved along the line S1P are (respectively)

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Q. Two light emitting sources of wavelength 500 nm are separated by a distance 2.2 x $ {{10}^{2}} $ cm. A detector can be moved on the line $ {{S}_{1}}{{S}_{2}} $ is perpendicular to $ {{S}_{1}}{{S}_{2}} $ as shown in figure below.
The minimum and maximum path difference at the detector as it is moved along the line $ {{S}_{1}}P $ are (respectively)Physics Question Image

VMMC MedicalVMMC Medical 2015

Solution:

The path difference is maximum when the detector is just at the position of $ {{S}_{1}} $ and its value is equal to $ 2.2\times {{10}^{-2}}, $ i.e. the separation between the sources. The path difference is minimum when the detector is at a large distance from $ {{S}_{1}}. $ In this case path difference is close to zero.