Optics Answers

An object 0.006 meters tall is placed 0.2 meters in front of a concave mirror and an image is formed 5 meters in front of the mirror. What is the focal length of the mirror? What is the height of the image?

An object is 28 centimeters from the center of a silvered spherical glass Christmas tree ornament 4.0 cm in diameter. What is the focal length of the ornament? Is it a concave or convex mirror? Will the image be real or virtual? Will the image be upright or inverted? What are the position and magnification of its image? If the object is 3.0-meter-high, what is the height of the image?

1.    An object 0.3 cm tall is placed 15.5 cm to the left of the vertex of a concave mirror with a center of curvature of 24.0 cm. Determine the position, size, orientation and type (real or virtual) of the image.

1.    An object is 28 centimeters from the center of a silvered spherical glass Christmas tree ornament 4.0 cm in diameter. What is the focal length of the ornament? Is it a concave or convex mirror? Will the image be real or virtual? Will the image be upright or inverted? What are the position and magnification of its image? If the object is 3.0-meter-high, what is the height of the image?

1. The speed of light in a material is 0.52c. What is the critical angle of a light ray at the interface between the material and a vacuum?

A communication system uses 10 km fibre having a loss of 2.3 D/Km. Calculate the output power if input power is 400 micro watt

A wire of length 3.45 m and mass 13.70 g is under a tension of 1.25 N. A standing wave has formed which has seven nodes excluding the endpoints. Calculates the frequency of this wave?

A rifle used for target shooting has a small telescope so that the shooter can accurately aim at his target. Suppose the telescope has a diameter of 1.5 cm and the shooter is looking at two small birds that are 200 m away. Assuming a red light of wavelength 600 nm shining on the birds, calculate how far apart are the birds.

a multimode, optimum near parabolic profile graded index fiber has a material dispersion parameter of 30 ps nm km when used with a good led source of rms spectral width 25nm. the fiber has a numerical aperture of 0.4 and a core axis refractive index of 1.48. estimate the total rms pulse broadening per kilometer within the fiber assuming waveguide dispersion to be negligible. hence, estimate the bandwidth length product for the fiber.

Estimate the maximum core diameter for an optical fiber with refractive index difference of 1.45% and core refractive index of 1.52 in order that it may be suitable for single-mode operation when operating wavelength is 0.85μm. Also calculate cut off wavelength cl if core diameter is 1.1μm.