Exam 18: Ray Optics

A tank holds a layer of oil,1.70 m thick,which floats on a layer of syrup that is 0.74 m thick.Both liquids are clear and do not intermix.A ray,which originates at the bottom of the tank on a vertical axis,crosses the oil-syrup interface at a point 0.90 m from the axis.The ray continues and arrives at the oil-air interface,2.00 m from the axis and at the critical angle.In the figure,the index of refraction of the oil is closest to:

A drop of unknown liquid is placed at the point on a glass surface where internal reflection is occurring at θ = 48°.The drop is heated until internal reflection occurs.What is the refractive index of the liquid if n_g = 1.60?

A ray in glass arrives at the glass-water interface at an angle of 48° with the normal.The refracted ray,in water,makes a 68° angle with the normal.The index of refraction of water is 1.33.In the figure,the angle of incidence of a different ray in the glass is 29°.The angle of refraction in the water is closest to:

You move a lens from your eye to arm's length away and a far scene never becomes inverted.What can you say about the focal length?

Situation 18.2 An erect object is 50 cm from a concave mirror of radius 60 cm. -In Situation 18.2,the distance of the image from the mirror,in cm,is closest to:

Total internal reflection can occur only when light passes from a material of high refractive index to one of low refractive index,never the other way around.

What experiment could you quickly do to detect the difference between a real diamond and an identically shaped fake?

The critical angle for an air-glass interface is 10.9 degrees.A ray in air is incident on the interface.The reflected ray is 100 percent polarized.The angle of refraction is closest to:

If an object is placed inside the focal point of a diverging lens,the image is

The speed of light in a material is 0.41 c.What is the critical angle of a light ray at the interface between the material and a vacuum?

A flashlight forms a 10 ft spot on a far wall.How can you tell if the filament is between the focal point and the spherical reflector or outside of it?

A virtual image will not show up on a screen,and it cannot be photographed.

A single diverging lens always produces a virtual image of an object.

You have several concave mirrors.What quick test could you make to choose the one with the best figure? (i.e. ,the most constant curvature)?

A screen and a converging lens of focal length f are arranged to have an image of the moon fall on the screen.What is the distance between the lens and the screen?

If an object is placed outside the focal point of a converging lens,the image is

A glass plate whose index of refraction is 1.66 is immersed in a liquid.The surface of the glass is inclined at an angle of 44° with the vertical.A horizontal ray in the glass is incident on the interface.When the liquid is a certain alcohol,the incident ray arrives at the interface at the critical angle.The index of refraction of the alcohol is closest to:

When moving a convex lens toward and away from your eye it reaches a point where the entire lens appears a single color.What is this point? Why?