Optics Answers

Without her contact lenses, Marissa cannot clearly see an object more than 40.0 cm away.

(a) Calculate the focal length of the contact lenses.

(b) What power and type (diverging or converging) of lens should her contact lenses have to give her normal vision?

(c) Suppose Marissa's near point (without her contact lenses) is 15.0 cm. What is the closest object she can see clearly with her contact lenses on?

An object is located 30.0 cm from a passenger's side mirror. The image formed is upright and one third the size of the object.

(a) Is the image real or virtual? Justify your answer.

(b) What is the focal length of the mirror?

(c) Is the mirror concave or convex? Justify your answer.

2. A beam of light strikes one face of a windowpane with an angle of incidence of 30.0°. The index of refraction of the glass is 1.52. The beam travels through the glass and emerges from a parallel face on the opposite side. Ignore reflections.

(a) Calculate the angle of refraction for the ray inside the glass.

(b) Show that the rays in the air on either side of the glass (the incident and emerging rays) are parallel to each other with the aid of a diagram.

(c) Calculate the speed of the light in the glass

1. The bright central fringe in a single-slit diffraction pattern from the blue light of wavelength 476 nm is 2.0 cm wide on a screen that is 1.05 m from the slit.

(a) Without calculating the slit width, determine the width of first-order bright fringe.

(b) How wide is the slit?

(c) If the blue light is replaced with monochromatic red light, what is the effect on the width of the bright central fringe? Briefly justify your answer

A multimode step index fiber has a material dispersion parameter of 250 ps 

nm−1km−l at 1.2 μm. Estimate the pulse broadening for a 10 kilometer long fiber 

with an LED source of spectral width 50 nm.

 A ray of light in corn oil is incident striking with an angle of incidence of 40 degrees on water. Calculate the angle of refraction to the nearest degree

 A ray of light in corn oil is incident striking with an angle of incidence of 40 degrees on water. Calculate the angle of refraction to the nearest degree

A ray of light in corn oil is incident striking with an angle of incidence of 40 degrees on water. Calculate the angle of refraction to the nearest degree

A plano convex lens( μ=1.5) with radius of curvature 20 cm is silvered at the curved surface. The power of the system is..?

if the acceptance cone for the given fiber is 68.16 calculate the maximum entrance angle and numerical aperture if the cladding glass has a refractive index of a 1.52 calculate the refractive index of cone