18 Questions
What is the sign convention for the object distance (BO) in lens formula calculations?
-u
Which type of lenses is the thin lens formula valid for?
Both concave and convex lenses
What are the two foci of a double convex or concave lens?
F and F'
Which is the first focal point in a double-convex or concave lens?
F
In image formation by a lens, what happens to a ray of light passing through the first principal focus of a convex lens?
It emerges parallel to the principal axis after refraction
What is the principle used to find the image of an object by a lens?
Laws of Refraction
What happens to a ray of light incident on a concave lens that appears to meet the principal axis at the second focus point?
It emerges parallel to the principal axis after refraction.
What is the magnification (m) defined as for a lens?
The ratio of the size of the image to that of the object.
In what cases is the magnification (m) positive for an image formed by a convex or concave lens?
For an erect (and virtual) image.
What is the first step in calculating the refractive index of a liquid given a glass lens with a refractive index of 1.47 disappears in that liquid?
Verify that n1 = n2 for the lens and liquid.
What does it mean if the focal length (f) of a lens equals infinity?
The lens does not refract light.
How does a double-convex lens differ from a double-concave lens?
A double-convex lens converges light while a double-concave lens diverges light.
What is the formula for the combined focal length of multiple thin lenses in contact?
$\frac{1}{f} = \frac{1}{f_1} + \frac{1}{f_2} + \frac{1}{f_3} + ...$
What happens to the net power in a lens combination if there are both convex and concave lenses involved?
The net power can be a mix of positive and negative values
What does the effective focal length of a double-convex lens depend on?
The curvature of both surfaces of the lens
In a compound microscope, how does the image formed by the first lens contribute to the second lens?
It becomes the object for the second lens
What assumption is made about the optical centers of thin lenses in contact?
They are coincident or overlapping
How does a prism affect light passing through it?
It disperses light into its constituent colors
Practice drawing ray diagrams for concave and convex lenses based on the rules illustrated in Figures 9.17. Verify the lens formula (Eq. 9.23) for different object positions with respect to the lens.
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