Optics Answers

Abid is a mirror-maker. He tries to be very economical when he makes his mirror, meaning he doesn’t want to waste any extra glasses. Now, his job is to make a mirror so that the user can see the whole image of his/her body standing at any distance from the mirror. If the height of the tallest man in the world is 2.5 m, what is the minimum height of the mirror (in meters) Abid needs to ensure?

What is the speed of an object, 2.0 kg, if its kinetic energy is 5.0 J?

An object is 39 cm front of a converging lens with a focal length of 28 cm. What is the magnification of the lens

Measure the image distance (q) and the image height (hi). Enter the data in the table.

trial mirror p (cm) q (cm) hi (cm) ho (cm)

1 Concave 7 2

2 Concave 6 2

3 Concave 5 2

4 Concave 2 2

5 Convex 6 2

Consider a step-index fiber for which n1 = 1.45, n2 = 1.24 and a = 24µm. What is the maximum value of numerical aperture.

Consider a step-index fiber for which n1 = 1.5, n2 = 1.30 and a = 25µm. What is the maximum value of numerical aperture.

Consider a step-index fiber for which n1 = 1.475, n2 = 1.460 and a = 25µm. What is the maximum value of θ for which the ray ill be guided by the fiber. 

Newton’s rings are formed in reflected light of wavelength 5890 *10^-8 cm with a

liquid between the plane and curved surfaces. The diameter of the fifth ring is

0.3 cm and the radius of curvature of the curved surface is 100 cm. Calculate

the refractive index of the liquid, when the ring is bright.

The speed of light in air is 3.0x10^8ms/2. Calculate the refractive index of the material which the fibre is made.

A light ray traveling through medium 1, index of refraction n1 = 1.80, reaches the interface between medium 1 and medium 2, index of refraction n2 = 1.24. At what minimum angle with respect to the normal must the ray be incident on the interface in order to be totally internally reflected? In format 10.0