A beam of ordinary light is incident on a system of four polaroids which are arranged in succession such that each polaroid is turned through `30^(@)` with respect to the preceding one. The percentage of the incident intensity that emerges out from the system is appromatelyA. `56%`B. `6.25%`C. `21%`D. `14%`

A beam of ordinary light is incident on a system of four polaroids whi

1.	A beam of ordinary light is incident on a system of four polaroids which are arranged in succession such that each polaroid is turned through `30^(@)` with respect to the preceding one. The percentage of the incident intensity that emerges out from the system is appromatelyA. `56%`B. `6.25%`C. `21%`D. `14%`
Answer» Correct Answer - C `I = (I_(0))/(2)(cos^(2)theta)^(n-1)` where n = number of polaroids

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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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