Optics Answers

Two lenses, one converging with focal length 20.0 cm and one diverging with focal length are placed 25.0 cm apart. An object is placed 60.0 cm in front of the converging lens. Determine (a) the position and (b) the magnification of the final image formed. (c) Sketch a ray diagram for this system.

The focal length of a given lens is -51 cm. Given that the image is virtual, erect, and 10 percent of the size of the object.

Now complete the following statements: 

The position of the object is ?

The position of the image is ?

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?