Optics Answers

A grid is illuminated with the yellow light from a sodium lamp (λ = 589.3 nm).
You can then see 7 light rays behind the grille. The angle between the two outermost rays was measured at 105.4o. The same grid is then illuminated with light of wavelength 435 nm.
How many rays can you ser?




A beam of light from a laser hits a grid with the grid constant of 1.67 microns. Behind the grid, 5 rays can be observed. The angle between the outermost rays was measured to 94.1 degrees. Calculate the wavelength of the laser light.

Two guitar strings have the same known length L, and same known linear mass density mu, vibrate at their common fundamental frequency of f1 Hz. you would like to know the frequency, f1, of the note you hear, but you don't have perfect pitch. Undeterred, you decide to use physics to find it. Both strings originally have some unknown T. You can increase the tension of one of the strings such that you known its tension is exactly 10% greater than that for the other one. Use your knowledge of interference and beats to find the orignally frequency, f1, in terms of the number of beats per second that you hear, n

A concave mirror has a focal length of 0.25 m. If an object produces a virtual image 0.04 m from the mirror, where is it located?

An object is placed 0.42 m away from a concave lens and has a height of 0.09 m . The image produce is -0.05 m tall. Where is the image located?

A 0.31 m tall object is placed 0.45 m from a converging lens with a 0.04 m focal length. How tall is the image?

The optical fiber has a ratio of core to cladding is 1.02 and refractive index of core is 1.50. Determine the i) critical angle, ii) Numerical aperture, iii) acceptance angle and iv) fractional index change.

Calculate the numerical aperture and acceptance angle for an optical diver having core of refractive index1.55 and cladding of refractive index1.50 respectively

two coherent source of light having intensity ratio 16:1 produce an interference fringe pattern

a man used a glasses of-1d to see distant object. Where should the object be placed to have an image which is half of the object? Write the answer in 2 decimal after dot and give a space to write the unit exampple 98.52 D or 22.12 kg

A converging lens has a focal length of 0.05 m. If an object is placed at 0.76 m from the lens, where will its image be located?

Is it real or virtual?