Optics Answers

screen is separate from double slit source at 2.5 m the distance between the two slits is 0.05mm the second order bright fringe (m=5)is 9.5cm from the center line .(a) determine the wavelength of the light.(b) calculate the distance between adjaseet bright fringe

screen is separate from double slit source at 2 m the distance between the two slits is 0.05mm the second order bright fringe (m=5)is 8.5cm from the center line .(a) determine the wavelength of the light.(b) calculate the distance between adjaseet bright fringe

Explain the term coherence in respect to light. Given that ∆𝒍 = 𝝀/𝝀2 explain 

what each symbol represent.

An object 4 cm high is placed 30 cm in front of the condenser lens. The focal length of this lens is 10 cm. a) Determine the position, height and orientation of the image. b) Suppose that you only now place a second, also converging lens to the right of the first lens at a distance of 20 cm from the first. Determine the focal length of the second lens if the image given by this two-lens system is formed 13.3 cm to the right of the first lens. The mentioned final image is inverted in relation to the original object. (Answer: a) di = 15 cm, m = -0.5, hi = -2 cm b) f₂ = 19.7 cm) I solved for a) but I don't know how to do under b).

The fish swims 2 m below the flat surface of the lake. At what apparent depth below the surface is the fish for the observer directly above it on the surface of the lake? The refractive index of water is 1.33.

The radius of curvature of the concave mirror is 60 cm. At what distance from the mirror should the object be placed so that the rays that came from the object to the mirror are reflected from the mirror, and then travel parallel to each other?(answer:30 cm)

A nearsighted person cannot see clearly beyond 75 cm. What lens him

would you prescribe to correct his distance vision problem?

The refractive index of the core and cladding materials of an optical fibre is 1.46

and 1.38, respectively. Calculate the critical angle, numerical aperture and

acceptance angle at the air-fibre interface.

In a laser, the lasing levels are the first excited state and the ground state of the

active medium. If the energy of the first excited state is 1.5eV, calculate the

frequency of the laser light.

What are the advantages of using optical fibre as communication medium?