Physics Ray Optics Level: High School
Young’s double slit experiment
Young’s double slit apparatus has the still separation of .12mm and the distance between the slits and the viewing screen is 55 cm . If monochromatic light of wavelength = 550*10-9E passes through the slits , Imagine in prob 4 that you are using Xrays of wavelength = 1*10-9Em, instead of visible light . What would the slit separation need to be in order to have the distance between the first two fringes be 1 cm ?
Physics Ray Optics Level: High School
Spherical Mirror
A tarantula of height 2 cm is in front of a spherical mirror whose final length has the absolute value (f) = 40 cm . The tarantula sees an image of itself that has a height of .40 cm and appears upright .a) Is the image real or virtual and is it on the same side of the mirror as the tarantula or the other side ?
b) Is the mirror concave or convex and what is the its focal length , including the correct sign .
Physics Ray Optics Level: High School
Polarization
Light strikes a glass plate at an angle of incidence of 60 degrees . A measurement shows that the angle between the reflected and refracted beams is 90 degrees with each other . What is the index of refraction of the glass ?
Physics Ray Optics Level: High School
Thin Films
A camera manufacturer wishes to deposit a non-reflective coating onto a glass lens for a wavelength of 550 nm . The index of refraction of the coating material is 1.38 and that of the glass is 1.53. Find the smallest three possible thicknesses for the coating .
Physics Ray Optics Level: High School
Diffraction
Suppose a single slit like the one in the figure at “click here” is 6.00 cm wide and in front of a microwave source operating at 7.5 GHz .a) Calculate the angle subtended by the first minimum in the diffraction pattern .
b) What is the relative I/Imax at theta = 15 degree ?
Physics Ray Optics Level: High School
Telescope
The diagram at “click here” illustrates Galileo’s original telescope . He used a convex objective-lens with a focal length of 1.7m and a concave eyepiece as illustrated above . When this telescope is focused on an indefinitely distant object , its angular magnification is +3 .a) What is the focal length of the eyepiece ?
b) What is the distance d between the two lenses ?
Physics Ray Optics Level: High School
Thin Films
In the illustration at “click here” , two glass plates have a slight angle between them because a speck of dust props up one edge of the top plate . When illuminated from above with light of wavelength 546 nm, eleven interference fringes are observed (counting from zero at the left edge) .a) Find the height of the dust speck .
b) Find the angle (in degrees) between the plates if their diameters are 2.00 cm .
Physics Ray Optics Level: High School
Refraction
In the diagram which is shown at “click here” , a ray from a spotlight strikes the surface of a swimming pool at an angle of 70 degree to the normal at a distance 4.00 m from the pool edge . The index of refraction for water is 1.33.a) Find the distance below the surface “Y” that the ray strikes the vertical wall .
b) Find the time between when the ray strikes the water and when it strikes the vertical wall .
Physics Ray Optics Level: High School
Doppler Effect
When a visible object is receding , its color will ?a) Not change in the slightest
b) Shift toward the blue end of the spectrum
c) Shift toward the red end of the spectrum
Physics Ray Optics Level: High School
Convex Lens
An object of 4 cm is placed 15 cm from a converging lens of focal length 10 cm as shown in Figure 3 at “click here” .Determine the image properties (where it is formed , height , real/virtual , magnified/diminished inverted/erect) using a ray diagram , as well as the lens formula .A second converging lens of focal length 15 cm is placed 36 cm behind the first lens as shown in figure 4 at “click here” . Describe the image formed in by this compound lens system . Again use a ray diagram as well as the lens formula .
Physics Ray Optics Level: High School
Canchy’s Formula
White light is incident at an angle of 30 degree on a triangular prism with apex angle 55 degree . For red light (lamda = 680 nm) the refractive index is 1.526 and for green light (lamda = 533 cm) the refractive index is 1.533 . What is the angle that the visible spectrum (red to violet) is spread over as it emerges from the prism ? (Hint : use Cauchy’s equation to determine the refractive index for violet light , lamda = 410 nm)
Physics Ray Optics Level: High School
Total Internal Reflection in a Prism
A periscope is made using the prism shown at “click here” to reflect the light rays through at 90 degree angle .What is the minimum possible refractive index the prism material must have in order for it to function as shown ? (Assume that the prism is in the air )
Discuss what will happen to the light ray if the refractive index of the prism is less than this value , and also what happens when the refractive index is increased ?
Physics Ray Optics Level: High School
Refraction
A beam of light with wavelength of 470 nm in vacuum is incident on a liquid of refractive index 1.37 at a glancing angle of 32 degree (see figure at “click here”)(i) What is the angle of refraction of the light ?
(ii) What is the wavelength of the light in the liquid ? (Hint : the frequency of light does not change in different media , however the velocity of the wave does , and for a wave the velocity and frequency are related as f lamda = v)
Physics Ray Optics Level: High School
Young’s Double Slit Experiment
Katrinal is using Young’s two-slit experiment to determine the separation and width of two slits . The wavelength of the light that is passed through the two slits is 590 nm . On the screen the separation of the bright fringes is 2.82 mm on a screen that is 2.20 m away . Katrina then blocks one of the slits and measures the distance from the central bright fringe to the first minima as 6.5 cm . What is the slit separation and the width of the slits ? (Hint : for small angles , sin theta = tan theta)
Physics Ray Optics Level: High School
Refraction
A 5 cm green arrow (light source ) that points due north is placed directly in front of a vertical north/south convex lens at do = (0.8 x focal length), a smaller distance than f , the resulting image points : then explain.a) north
b) south
c) east
d) west
e) up
f) down
g) no image formed
