Optics Answers

In fibreoptics the type of cable is chosen by
a) matching the diameter of the cable to the wavelength
b) distance required to travel
c) the strength of signal needed

A mirror.
Option A. refracts all light.
Option B. reflects all light.
Option C. absorbs a percentage of light.

Which one is true

A small aperture is illuminated with a parallel beam of λ = 628nm . The emergent beam has an angular divergence of 2∘ . The size of the aperture is.

A student uses a converging lens to produce an enlarged virtual image of a scale he whishes to read accurately. The focal length is 10cm. What is the appropriate distance between the scale and the lens?

There is a convex spherical mirror with a focal length of 16.00 cm. When a figurine is placed in front of it, an upright image 3.00 cm tall is formed 6.80 cm behind the mirror.
Find the position of the figurine
Find the magnification of the image

Calculate the critical angle of a material having a refractive index of 1.52 when light passes from the material to air

8. Newton’s rings formed by monochromatic light between a flat glass plate and a plano-convex lens are viewed normally. Calculate the order of the dark ring which will have double the diameter of that of 40th dark ring.

A slit of width a is illuminated by white light
1. For what value of a will the first minimum for red light of wavelength 650nm appear at an angle 15°
2. What is the wavelength of the light whose first side diffraction maximum is at 15°, thus coinciding with the first minimum for the red light.

In a double slit experiment, the wavelength of the light source is 405nm, the slit separation d is 19.44*10^-6m and the slits width a is 4.050*10^-6m. Consider the interference of the light from the two paths and also the diffraction of the light through h slits.
1. How many bright interference fringes are within the central peak of the diffraction envelope
2. How many bright fringes are within either of the first side peaks of the diffraction envelope

A concave mirror is used in opthalmoscope. explain