Optics Answers

Show all the solutions and support your answers.

 A 4.8 cm tall image is located 3 cm in front of a lens whose focal length is -6 cm.

a) Solve for the distance in which the object is placed in front of the lens.

b) Solve for the magnification

c) Solve for the height of the object.

d) Is the image upright or inverted?

Show all the solutions and support your answers.

1. An object is located 10 cm from a lens of focal length 12 cm.

                 a) Solve for the image distance

                 b) Solve for the magnification

                  c) Is the image real or virtual?

                   d) Is the image reduced or enlarged?

While building your first telescope, your nerd friend suggested a brilliant idea for you to try and replace the reflecting mirror of the telescope by a fisk of mercury rotating about a vertical axis with some angular velocity w that forms a spherical surface of radius R, in such a telescope, the the focal length of the telescope would be function of the rotating speed of the mercury disk, calculate how much angular velocity is needed for the telescope to have a focal length of 15 cm?

A source of light emit light waves with wavelength of 550 nm. Find the time period of the wave length

For a step index fibre with a core of refractive index of 1.54 and cladding refractive index 1.5 calculate the following when fibre is kept in water

b)Numerical aperture

c)Acceptance angle

d)Numerical Aperture in air

For a step index fibre with a core of refractive index of 1.54 and cladding refractive index 1.5 calculate the following when fibre is kept in water

a)Fractional refractive index

Locate the image formed by refraction in the situation shown in figure. The point C is the centre of curvature.

How can you keep a constant source of light in a localized area, from a moving light source without any of it diminishing?

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?