An object is imaged by a converging spherical mirror as shown in the figure. Suppose a black cloth is put between the object and the mirror so that it covers everything above the optic axis. How will the image be affected?

Select the correct answer for the following question:
The area of our eye where visual acuity is best is the
a. macula lutea.
b. optic disc.
c. fovea centralis.
d. pupil.

A salesman tries to sell you an optic fiber that claims to give linearly polarized light when light is totally internally reflected off the fiber-air interface. (a) Would you buy it? Explain. (b) If total internal reflection occurs at an angle of $42^{\circ},$ what would be the polarizing (Brewster) angle?

An Object at an Angle. A $16.0-\mathrm{cm}$-long pencil is placed at a $45.0^{\circ}$ angle, with its center $15.0 \mathrm{~cm}$ above the optic axis and $45.0 \mathrm{~cm}$ from a lens with a $20.0-\mathrm{cm}$ focal length as shown in Fig. we saw earlier . (Note that the figure is not drawn to scale.) Assume that the diameter of the lens is large enough for the paraxial approximation to be valid. (b) What is the length of the image (that is, the distance between the images of points $A$ and $B$ )?

cerebrum , cerebellum , operculum, optic tectum

Explain how the absorption of a photon of light leads to excitation of an optic nerve fiber.

Damage to the nerve could result in defects of eye movement. a. optic b. vagus c. trigeminal d. facial e. abducens

In the given figure, suppose a stroke or trauma destroyed just the red fibers in the circled area labeled "Optic radiation." Predict how this would affect the subject's visual field for each eye. Predict the same for a lesion that cut completely across the circled area labeled "Optic tract."

What takes place to a light ray that passes through the focal point at an angle to the optic axis of a concave mirror?

Calculate the relative irradiance (compared to the unobstructed irradiance) on the optic axis due to a double-slit aperture that is both $10 \mathrm{~cm}$ from a point source of monochromatic light $(546 \mathrm{~nm})$ and $10 \mathrm{~cm}$ from the observation screen. The slits are $0.04 \mathrm{~mm}$ in width and separated (center to center) by $0.25 \mathrm{~mm}$.

A 1.20-cm-tall object is $50.0 \mathrm{~cm}$ to the left of a converging lens of focal length $40.0 \mathrm{~cm}$. A second converging lens, this one having a focal length of $60.0 \mathrm{~cm}$. is located $300.0 \mathrm{~cm}$ to the right of the first lens along the same optic axis. (b) $I_1$ is now the object for the second lens. Find the location and height of the image produced by the second lens. This is the final image produced by the combination of lenses.

Circle True or False. At the optic chiasma, the fibers from the medial side of each eye cross over to the opposite side.

Find the indicated quantities.

The diameters of a sample of fiber-optic cables were measured with the following results (diameters are class marks):

Draw a histogram for these data.

All of the following except the nerve begin or end in the orbit. a. optic b. oculomotor c. trochlear d. abducens e. accessory