You have an optical instrument but you\'re not sure whether itis a mirror or a l

Question

You have an optical instrument but you're not sure whether itis a mirror or a lens, so you use it to make some observations.(Please note that you're attempting to discover what opticalinstrument you have using a process of elimination. As such, youranswers in each question are dependent upon your answers to theprevious questions. i. e. Once an optical instrument is eliminatedas a possibility, you should consider it eliminated for eachquestion thereafter.)

(a) When you place an object at a particularspot in front of your optical instrument you observe that the imageof the object is smaller than the object itself. What could youroptical instrument be? Select all the possibilities from the listbelow.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(b) When you then move the object toward the optical instrument asmall distance you observe that the image of the object increasesin size. What could your optical instrument be? Select all thepossibilities from the list below.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(c) You also observe that the image created by the opticalinstrument is inverted compared to the object. What could youroptical instrument be? Select all the possibilities from the listbelow.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(d) Finally, you observe that when you bring the object quite closeto the optical instrument the image is upright and on the same sideof the optical instrument as the object. What is your opticalinstrument?
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens. (a) When you place an object at a particularspot in front of your optical instrument you observe that the imageof the object is smaller than the object itself. What could youroptical instrument be? Select all the possibilities from the listbelow.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(b) When you then move the object toward the optical instrument asmall distance you observe that the image of the object increasesin size. What could your optical instrument be? Select all thepossibilities from the list below.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(c) You also observe that the image created by the opticalinstrument is inverted compared to the object. What could youroptical instrument be? Select all the possibilities from the listbelow.
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

(d) Finally, you observe that when you bring the object quite closeto the optical instrument the image is upright and on the same sideof the optical instrument as the object. What is your opticalinstrument?
A concave mirror.
A convex mirror.
A plane mirror.
A converging lens.
A diverging lens.

Explanation / Answer

We assume that the "particular spot" is beyond the center ofcurvature. a) concave mirror - images are smaller when beyond the center ofcurvature (ok) convex mirror - images always appear smaller (car mirrors areconvex) (ok) plane mirror - images always appear the same size (X) converging lens - images are smaller when beyond the center ofcurvature (ok) diverging lens - make images smaller (ok) Now, the object is at a point between the center of curvature andthe focal point. b) concave mirror - when the object is closer, the image is larger(mirrors in fitting rooms are usually slightly concave) (ok) convex mirror - when cars get closer to the side mirrors, theirimages get larger (ok) plane mirror - the object and the image are always the same size nomatter where the object is located (X) converging lens - if you moved an object closer to a magnifyingglass, the object gets larger (ok) diverging lens - glasses are diverging lenses, images will getlarger if they get closer (ok) c) concave mirror - the object is behind the focal point, object isinverted (ok) convex mirror- always produces upright images (X) plane mirror - always produces a virtual image (not inverted)(X) converging lens - when the object is between the center ofcurvature and the focal point, the object is inverted (ok) diverging lens - since diverging lenses diverge rays from oneanother, an inverted image will never be produced (X) Assume that the object is between the focal point and themirror. d) concave mirror - image is upright (a person in a fitting room isstanding between the focal point and the mirror), but the image isbehind the mirror (X) converging lens - image is upright, and the image is in front ofthe lens and behind the object (a magnifying glass enlarges theobject, and the image is seen through the lens) (ok)

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