Optics Answers

Given 1 log unit at 500 nm is 100 W, what is the number of watts at 550 nm?

Two very narrow slits are spaced 1.80 mm apart and are placed 35.0 cm from a screen.

What is the distance between the first and second dark lines of the interference pattern when the slits are illuminated with coherent light with wavelength 550 nm?

If the angle of incidence of a ray of light on a plane mirror is 40°, the deviation of the incident ray after reflection is

assuming that the resolving power of the eye is determined by diffraction effects only, calculate the maximum distance at which two objects separated by a distance of 2 m can be resolved by the eye. (assume pupil diameter to be 2 mm and λ = 6000 å.)

why is the sky blue?

describe in physical phenomena

The length of a pin hole camera 10.1 m. How far is an object 1m high placed from the pin hole for the image to be 0.025 m high.

A 1.6 m tall girl stands 3.2 m from a convex mirror . What is the focal length of the mirror if her image appears to be 0.28 m tall? 

The materials called phosphors that coat the inside of a fluorescent lamp convert ultraviolet radiation (from the mercury-vapor discharge inside the tube) into visible light. Could one also make a phosphor that converts visible light to ultraviolet? Explain.

During the photoelectric effect, light knocks electrons out of metals. So why don’t the metals in your home lose their electrons when you turn on the lights?

There is a certain probability that a single electron may simultaneously absorb two identical photons from a high-intensity laser. How would such an occurrence affect the threshold frequency? Explain.