Physics Ray Optics Level: High School
In the fig 34-24 , a beam of unpolarized light , with intensity 43 W/m^2 , is sent into a system consisting of two polarizing sheets with polarizing directions at angles θ1= 73 degree and theta 2 = 90 degree to the y axis . What is the intensity of the light transmitted by the system ?
Question Diagram
Physics Ray Optics Level: High School
In the fig 34-24 ,a beam of light , with intensity 63 W/m^2 and polarization parallel to a y axis , is sent into a system of two polarizing sheets with polarizing directions at angles of theta 1 = 52 degree and theta 2 = 90 degree to the y axis . What is the intensity of the light transmitted by the two-sheet system ?
Question Diagram
Physics Ray Optics Level: High School
Polarization
In the fig 34-23 , initially unpolarized light is sent into a system of three polarizing sheets whose polarizing direction make angles of theta 1 = 36 degree θ 2 = 28 degree , and theta 3 = 52 degree with the direction of the y axis . What percentage of the light’s initial intensity is transmitted by the system ?
Question Diagram
Physics Ray Optics Level: High School
Colors seen when gasoline forms a thin film on water are a demonstration ofa) polarization .
b) refraction .
c) dispersion .
d) interference.
e) reflection .
Physics Ray Optics Level: High School
Two optically flat sheets of glass of length 10 cm are in contract at one end and held separate at the one end by a hair of diameter 30 micro m , so that a thin wedge of air is formed between them . Monochromatic light of wavelength 590 nm illuminates the sheets from above by normal incidence .a) Long, straight closely-spaced interference fringes are seen . Explain why . Explain carefully whether the lone of contact between the two sheets is a bright fringe or a dark fringe .
b) Calculate the horizontal separation of the fringes .
Physics Ray Optics Level: High School
A lens of +20 cm focal length forms an inverted image 60 cm to the right of the lens. A second lens of focal length -30 cm is placed 20 cm to the right of the first lens .a) Where is the object relative to the first lens (+20 cm focal length) ?
b) Locate and fully describe the final image , including its overall magnification .
Physics Ray Optics Level: High School
a) A double convex lens , both surfaces of which have radii of 20 cm , is made of glass whose refractive index is 1.5. Find the size of the lens .
b) An object 40.0 mm high is placed 52.4 cm from a converging lens . An image is formed 25.8 cm from the lens . Find the size of the image , whether it is real or virtual and the focal length of the lens .
c) A concave spherical mirror of radius of curvature 2 m is mounted on a wall. You walk towards it at a speed of 1.5 ms^-1 . When you are at a distance of 5 m , find the location of your image and its apparent speed .
Physics Ray Optics Level: High School
a) A hunter is aiming to spear a fish whose image cab be seen in the clear water . Should he aim above or below the image of the fish ? Explain with the aid of a sketch .
b) Show that a ray of light , passing through a plate of optical glass with parallel sides ,of thickness s , suffers a displacement x perpendicular to the line of the original path given by : x = (s / cos r) x sin (i-r) Explain why there would be no dispersive effect , if a beam of white light were passed through the glass block .
Physics Ray Optics Level: High School
As the train moves , the top of the pantograph moves along the cable , generating a transverse wave which carries energy away from the pantograph . Calculate the minimum tension needed in the cable in order to avoid energy from the wave damaging the pantograph , if the maximum speed of the train is to be 245 km h^-1 . The steel cable has a diameter of 1 cm and density as given above .
Physics Ray Optics Level: High School
The motion of a train along the tracks generates sound waves in the steel rails. This in turn sets up sound waves in the air. Calculate and compare the speed of sound in air and the rails . [Assume Young’s modulus for steel = 2.0 x 10^11 Nm^2 , density of steel = 7800 kg m^-3, density of air at standard temperature and the pressure = 1.29 kg m^-3, and standard atmospheric pressure = 1.013 x 10^5 Nm^-2]
Physics Ray Optics Level: High School
Concave Mirror
A concave shaving mirror has a radius of curvature of +32.3 cm . It is positioned so that the (upright) image of a man’s face is 3.05 times the size of the face . How far is the mirror from the face
Physics Ray Optics Level: High School
Plane Mirror
A moth at about eye level is 7.8 cm in front of a plane mirror , you are behind the moth , 31 cm from the mirror . What is the distance between your eyes and the apparent position of the moth’s image in the mirror ?
Physics Ray Optics Level: High School
Total Internal Reflection
The index of refraction of a certain liquid is 2.7 . What is the critical angle for a light ray traveling in this liquid toward a flat layer of air above it ?
Physics Ray Optics Level: High School
Refraction
In the figure at “click here” , a 2.52 m-long vertical pole extends from the bottom of a swimming pool to a point 51.9 cm above the water . Sunlight is incident at angle 55.0 degree . What is the length in meters of the shadow of the pole on the level bottom of the pool ? The water has an index of refraction of 1.33 .
Physics Ray Optics Level: High School
Refraction
Light in vacuum is incident on the surface of a slab of transparent material . In the vacuum the beam makes an angle of 36.9 degree with the normal to the surface , while in the slab it makes an angle of 29.0 degree with the normal . What is the index of refraction of the transparent material ?Li = 36.9 degree
Lr = 29 degree
Index of refraction = micro = sin i / sin r
micro = sin 36.9 degree / sin 29 degree
= 1.238