12 Long battery lif US Halliday AVE MOTION OPTICS AND SOUND (PHYS 130) Limited o
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12 Long battery lif US Halliday AVE MOTION OPTICS AND SOUND (PHYS 130) Limited on-campus access only I Register Now Halliday, Fundamentals of Physics, 10e ignment You grind the appropriate, you select the 30 cm radius. Then you hold each lens in sunshine to form an image of the Sun. What are the (a) focal length fand (b) image type (real or virtual) for (bi shown in the figure from flat glass disks (n 1.7) using a machine that can grind a radius of e of either 30 am or 42 om. In a lens where either radius is ) lens 1, (c) fand (d) image type for (olane convex) lens 2, (e) fand (f) image type for (meniscus convex) lens 3, (a) f and (h) image type for (bi-concave) lens 4, () f and G) mage type for (elane concave) lens 5, and (k) fand (1) image type for (meniscus concave) lens 6? Units Units (9) N UnitsExplanation / Answer
givne n = 1.7
R = 30 cm or 42 cm
for R = 30 cm
from lens makers formula
1/f = (n - 1)(1/R1 - 1/R2)
a. R1 = 30 cm
R2 = -30 cm
n = 1.7
hence
f = 21.4285 cm
b. for biconves lens, image of sun is real and on its focus
c. for lens 2
R1 = inf
R2 = -30 cm
hence
f = 42.8571 cm
d. image is again real ( as focal length is +ve)
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