Related InterviewSolutions

• Light of wavelength `6328 Å` is incident normally on a slit having a width of `0.2 mm`. The distance of the screen from the slit is `0.9 m`. The angular width of the central maximum isA. `0.09^(@)`B. `0.72^(@)`C. `0.18^(@)`D. `0.36^(@)`
• A single slit of width `0.20 mm` is illuminated with light of wavelength `500 nm`. The observing screen is placed `80 cm` from the slit. The width of the central bright fringe will beA. `1 mm`B. `2 mm`C. `4 mm`D. `5 mm`
• A parallel beam of sodium light of wavelength `6000 Å` is incident on a thin glass plate of `mu=1.5`, such that the angle of refraction in the plate is `60^(@)`. The smallest thickness of the plate which will make it appear dark by reflected light isA. `40 Å`B. `4 Å`C. `400 Å`D. `4000 Å`
• Light of wavelength `5000 Å` is travelling in air. A thin glass plate (mu=1.5) of thickness `1 mm` is placed in the path of light. The change in phase of light isA. zeroB. `pi//2`C. `pi`D. `(3pi)//2`
• A thin mica sheet of thickness `2xx10^-6m` and refractive index `(mu=1.5)` is introduced in the path of the first wave. The wavelength of the wave used is `5000Å`. The central bright maximum will shiftA. `2` fringes upwardB. `2` fringes downwardC. `10` fringes upwardD. none of these
• In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength `lambda`), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate isA. `2lambda`B. `2lambda//3`C. `lambda//3`D. `lambda`
• When a transparent parallel plate of uniform thickness `t` and refractive index `mu` is interposed normally in the path of a beam of light, the optical path isA. increased by `mut`B. decreased by `mut`C. decreased by `(mu-1)t`D. increased by `(mu-1)t`
• A screen is placed 50cm from a single slit, which is illuminated with 6000Å light. If distance between the first and third minima in the diffraction pattern is 3.0 mm, what is the width of the slit?
• Which one of the following phenomena is not explained by Huygens construction of wavefront?A. refractionB. reflectionC. diffractionD. origin of spectra
• The phenomenon of interference is shown byA. longitudinal mechanical waves onlyB. transverse machanical transverse waves onlyC. non-mechanical transverse waves onlyD. all the above types of waves