Question

*Express all numeric answers in SI units unless otherwise
instructed.*

- Why is the index of refraction always greater than or equal to 1?
- What is the relationship between the power of a lens and its focal length?
- (a) What is the power of a converging lens with focal length 12.0 cm? (b) What is the power of a diverging lens with focal length -22.0 cm?
- Can you start a fire with a converging lens? What about with a diverging lens? Explain.
- What is a
*real image*? What type of lens must you use to create one?

Answer #1

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clarification.**

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A thin plastic lens with index of refraction n = 1.64 has radii
of curvature given by R1 = ?10.0 cm and R2 = 45.0 cm.
(a) Determine the focal length in cm of the lens. cm
(b) Determine whether the lens is converging or diverging.
Determine the image distances in cm for object distances of
infinity, 3.00 cm, and 30.0 cm.
(c) infinity
(d) 3.00 cm
(e) 30.0 cm

You are given a lens made of glass with an index of refraction,
n = 1.45, and radii of curvature, R1 = 10 cm and
R2 = -80 cm.
a) Calculate the focal length of this lens.
b) A 5 cm tall object is placed 30 cm in front of this lens.
Determine the image distance and the height of the image. Is the
image upright or inverted?
c) Draw a diagram to illustrate with the object and image
positions...

1.The observer is in air nearly above the object submerged in
water (index of refraction 1.33). The depth of the object is 4.5cm.
Find the apparent depth of the object. (Hint: Use Snell’s law
of refraction and the fact that the angles of incidence and
refraction are small, so tan θ ≈ sin θ.)
2.When a diverging lens is held 10.9 cm above a line of print,
the image is 3.1 cm beneath the lens. (a) Is the
image real...

a) The index of refraction of a certain substance is 1.63.
Consider a ray of light in this substance, traveling toward a flat
interface with another material of n = 1.34. What is the largest
incident angle for which any light will transmit into the second
medium? Express your answer in degrees.
b) An object is 19.9 cm in front of a two-lens system. They are
both converging lenses, with focal lengths f1 = 10.03 cm for the
one closer...

Part A: A plastic lens is made with material with index of
refraction n=1.4. If the front lens is ground to a radius of 1.3 m
and the rear lens ground to a radius of -0.9 m, what is the
refractive power of the lens? Answer: 0.75
diopters
Part B: A plastic lens is made with material with index of
refraction n=1.4. If the front lens is ground to a radius of 1.3 m
and the rear lens ground to...

Chapter 25 Part 3
1. You can determine the index of refraction of a substance by
determining its critical angle. What is the index of refraction of
a substance that has a critical angle of 46.7º when submerged in
water (n = 1.333)?
2. What magnification will be produced by a lens of power –4 D
(such as might be used to correct myopia) if an object is held 28.3
cm away?
3. A doctor examines a mole with a...

1. Light traveling in air (index of refraction 1.00) falls onto
a thin plastic film (index of refraction 1.30) of unknown thickness
that covers glass (index of refraction 1.50). What minimum non-zero
thickness is needed such that wavelengths of 650 nm in air are
bright in the reflection?
2. You observe two point sources of light that are spaced 10 cm
apart which are each emitting light of wavelength of 590 nm. If the
diameter of your pupil is 2...

A doctor examines a mole with a 15.1 cm focal length magnifying
glass held 11.4 cm from the mole How big is the image in
millimeters if the mole is actually 4.2 mm in diameter?
What is the focal length of 2.4 D reading glasses found on the
rack in a pharmacy?
How far, in centimeters from the lens must the film in a camera
be, if the lens has a 36.3 mm focal length and is being used to...

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