Optics Answers

An installed surveillance in Camella St. uses a concave mirror whose focal length is 6.24m. A crime scene was recorded where the suspect stabbed a man walking on the street. The suspect image distance from the surveillance was 11.3m. The height of the suspect’s image is 0.9m. Make a ray diagram and a sketch of the actual scene

In a double slit interference arrangement,
fringes are produced with monochromatic
light of wavelength 550 nm. A thin plate of
glass (p. = F5) is placed in the path of one of
the interfering beams. The central band of
fringe system moves into position occupied
by the third bright band from the centre.
Calculate the thickness of the glass plate.

The LEDs used in early optical communication systems had a spectral width ∆λ0 of about 20 nm around λ0 = 825 nm. Find τm if Dm = 84.2 (ps/km-nm) and given length of fiber is 2Km.

Consider a parabolic-index multimode fiber with n1= 1.46, ∆ = 0.01, operating at 850 nm with an LED of spectral width 20 nm. For such a fiber find the intermodal dispersion and total dispersion with its bit rate.(material dispersion = 1.7ns/Km.

A glass hemisphere of refractive index 4/3 and of radius 4 cm is placed on a plane mirror . A point object is placed at distance ' d ' on the axis of this sphere. If the final image is formed at infinity then find the value of d.

Given answer = 3 cm

A multimode step index fiber has a relative refractive index difference of 1%, and a core refractive index of 1.5. The number of modes propagating at a wavelength of 1.3um is 1100. Estimate the diameter of fiber core

The focal length of a projector lens is 10 cm. This forms an image at 5 cm of 2 cm x 2 cm slider. The size of image on the screen is _______

An atomic system consisting of two energy levels,with population of higher energy level less than that of the lower level,is in the thermal equilibrium. show that the absorption of radiation dominates stimulated emission if radiation of appropriate frequency is introduced into the system.comment on the consequences of this fact for laser action .

The optic power, after propagating through a fibre that is 500 m long is reduced to 25% of its original value.Calculate the fibre loss in dB/km.

you place a object 23cm in front of a diverging lens which has a focal length with magnitude of 13.4cm. determine how far the object should be placed to reduce image size by factor of 4.35