When light is incident from air to glass at an angle `57^@`, the reflected beam is completely polarised. If the same beam is incident from water to glass, the angle of incidence at which reflected beam is completely polarised will beA. (a) `theta=57^@`B. (b) `thetagt57^@`C. (c) `thetalt57^@`D. (d) cannot be determined

When light is incident from air to glass at an angle `57^@`, the refle

1.	When light is incident from air to glass at an angle `57^@`, the reflected beam is completely polarised. If the same beam is incident from water to glass, the angle of incidence at which reflected beam is completely polarised will beA. (a) `theta=57^@`B. (b) `thetagt57^@`C. (c) `thetalt57^@`D. (d) cannot be determined
Answer» Correct Answer - C `_wmu_glt_amu_g` and `tan theta=mu`

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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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