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Optics
the focal length of a concave mirror is40cm. where should an object be placed so as to get its real image magnified four times
Optics
why does a pencil submerged in appears bent?
Optics
if image is virtual than tell its distance from mirror
Optics
angle of prism is 5 degree, refractive index of prism 1.5, ray emerges out normally from other face.
find angle of incidence.
find angle of incidence.
Optics
Cut a narrow slit in a thin sheet of opaque material. Immerse the sheet in a liquid,
such as water. After removing the sheet from the liquid, you will see a liquid film in
the slit.
why ?
such as water. After removing the sheet from the liquid, you will see a liquid film in
the slit.
why ?
Optics
Explain the following :1. Infrared radiations are used for photography in fog.
2. Infrared radiations are used for signals during war .
3.The photographic darkrooms are provided with infrared lamps.
4.A rocksaltprism is used instead of a glass prism to obtain the infrared
spectrum
5. A qartz prism is reqiured for obtaining the spectrum of a violet light .
6. Ultraviolet bulbs have a quartz envelope instead of glass.
2. Infrared radiations are used for signals during war .
3.The photographic darkrooms are provided with infrared lamps.
4.A rocksaltprism is used instead of a glass prism to obtain the infrared
spectrum
5. A qartz prism is reqiured for obtaining the spectrum of a violet light .
6. Ultraviolet bulbs have a quartz envelope instead of glass.
Optics
When mean optical power launched into an 8 km of fiber is 120 mW, the output mean optical power is 3 microwatt. Determine:
(a) overall loss in dB
(b) single attenuation per kilometre
(a) overall loss in dB
(b) single attenuation per kilometre
Optics
Determine the cut off wavelengh for step index fibre to exhibit single mode operation when the core refractive index and radius are 1.46 and 4.55 mm respectively, while the refractive index difference being 0.255.
Optics
an object T is kept 60 cm in front of a plane mirror M.If the mirror is now moved 15 cm away from the object,how does the image shift from its previous position ?
Optics
light ray enter from air to fiber the refrective index of air is 1,the refrective index of fiber is 1.5(core),the refrective index of fiber is 1.48(cladding).find critical angle,refractional index,acceptance angle,numerial aperature.
