Two light waves arrives at a certain point on a screen. The waves have the same wavelength. At the arrival point, their amplitudes and phase differences are : (I) `2a_(0),6a_(0)" and "pi " rad"` (II)`3a_(0),5a_(0)" and "pi " and"` (III) 9a_(0), 7a_(0), " and "3pi " rad"` (IV) 2a_(0), 2a_(0) " and "0`. The pair/s which has greatest intensity is/are :A. IB. IIC. II,IIID. I, IV

Two light waves arrives at a certain point on a screen. The waves have

1.	Two light waves arrives at a certain point on a screen. The waves have the same wavelength. At the arrival point, their amplitudes and phase differences are : (I) `2a_(0),6a_(0)" and "pi " rad"` (II)`3a_(0),5a_(0)" and "pi " and"` (III) 9a_(0), 7a_(0), " and "3pi " rad"` (IV) 2a_(0), 2a_(0) " and "0`. The pair/s which has greatest intensity is/are :A. IB. IIC. II,IIID. I, IV
Answer» Correct Answer - B

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Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
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