Unformatted text preview: Physics 117: HW— 11: Ch 33 and 34', Due on Nov. 17, 18 before the class begins Problem 1: (a) An electromagnetic wave of intensity 200 W/m2 is incident normally on a
rectangular black card with sides of 20 cm and 30 cm that absorbs all the radiation. Find the
force exerted on the card by the radiation. (b) Find the force exerted by the same wave if the card
reﬂects all the radiation incident on it. Problem 2. The electric ﬁeld of an electromagnetic wave oscillates in the y direction and the
Poynting vector is given by S(x, t) = (100W /m2)cos2 [10x — 3 x 109 t], where x is in meters and t is in seconds. (a) What is the direction of propagation of the wave? (b) Find the wavelength and
the frequency. (c) Find the electric and magnetic ﬁelds. Problem 3. In a stack of polarizing sheets, each sheet has its polarization axis rotated 140
with respect to the preceding sheet. If the stack passes 17 % of the incidence, unpolarized light,
how many sheets does it contain. Problem 4: The prism in the Figure has n=1.52, a = 60° and is
surrounded by air. A light beam is incident at 491 = 37°. Find the
angle (5 through which the beam is deﬂected. Problem 5. Two converging lenses, each having a focal length equal to 10 cm, are separated
by 35 cm. An object is 20 cm to the left of the ﬁrst lens. (a) Find the position of the ﬁnal image
using both ray diagram and the thinlens equation. (b) Is the ﬁnal image real or virtual? Is the
ﬁnal image upright or inverted? (c) What is the overall lateral magniﬁcation of the ﬁnal image? Problem 6. My contact lens prescription calls for + 2.25 diopter lenses with an inner
curvature radius of 8.6 mm to ﬁt my cornea. (a) If the lenses are made from plastic with n =
1.56, what should be the outer curvature radius? (b) Wearing these lenses, I hold a news paper 30
cm from my eyes. Where is its image as viewed through the lenses? Problem 7. The Hubble Space Telescope is essentially a Cassegrain reﬂector, shown in the
ﬁgure. The focal lengths of the concave primary and convex secondary mirrors are 5520.00 mm
and 679.00 mm, respectively. The secondary is located at 4906.071 mm from the apex of the
primary. Using appropriate equations determine where in Figure such rays are ﬁnally focused.
Describe the ﬁnal image. ...
View
Full Document
 Spring '08
 TIESINGA

Click to edit the document details