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exam_2_review [2014/05/14 05:09] nugentm [Review question 1] |
exam_2_review [2014/05/14 14:48] (current) wikimanager [Review problem 3] added solution |
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====Review question 2==== | ====Review question 2==== | ||
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm? | A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm? | ||
- | * [....] A) 5.0 | + | * [ <color green>X</color> ] A) 5.0 |
* [....] B) 4.0 | * [....] B) 4.0 | ||
* [....] C) 1.0 | * [....] C) 1.0 | ||
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* [....] C) $+2.5$ diopters | * [....] C) $+2.5$ diopters | ||
* [....] D) $+2.7$ diopters | * [....] D) $+2.7$ diopters | ||
- | * [....] E) $-2.5$ diopters | + | * [ <color green>X</color> ] E) $-2.5$ diopters |
<color green></color> | <color green></color> | ||
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* [....] A) Convex. | * [....] A) Convex. | ||
* [....] B) Plane. | * [....] B) Plane. | ||
- | * [....] C) Concave. | + | * [ <color green>X</color> ] C) Concave. |
* [....] D) All of the given answers would work equally as well. | * [....] D) All of the given answers would work equally as well. | ||
* [....] E) None of the given answers would burn a hole. | * [....] E) None of the given answers would burn a hole. | ||
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You have a choice between two lenses of focal lengths $f_a$ and $f_b = 2 f_a$ to use as objective lens in building a compound microscope. If the magnification you obtain using lens //a// is $M_a$, what will be the magnification when using lens //b//? | You have a choice between two lenses of focal lengths $f_a$ and $f_b = 2 f_a$ to use as objective lens in building a compound microscope. If the magnification you obtain using lens //a// is $M_a$, what will be the magnification when using lens //b//? | ||
* [....] A) $M_b = \frac{1}{4} M_a$ | * [....] A) $M_b = \frac{1}{4} M_a$ | ||
- | * [....] B) $M_b = \frac{1}{2} M_a$ | + | * [ <color green>X</color> ] B) $M_b = \frac{1}{2} M_a$ |
* [....] C) $M_b = 8 M_a$ | * [....] C) $M_b = 8 M_a$ | ||
* [....] D) $M_b = 4 M_a$ | * [....] D) $M_b = 4 M_a$ | ||
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Which of the following expressions is correct for the transmitted intensity of an unpolarized beam of light with an intensity $I_i$ passing through a polarizer? | Which of the following expressions is correct for the transmitted intensity of an unpolarized beam of light with an intensity $I_i$ passing through a polarizer? | ||
* [....] A) $I_t = 2 I_i$ | * [....] A) $I_t = 2 I_i$ | ||
- | * [....] B) $I_t = \frac{1}{2} I_i$ | + | * [ <color green>X</color> ] B) $I_t = \frac{1}{2} I_i$ |
* [....] C) $I_t = I_i$ | * [....] C) $I_t = I_i$ | ||
* [....] D) $I_t = 4 I_i$ | * [....] D) $I_t = 4 I_i$ | ||
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* [....] A) neither spherical nor chromatic aberration. | * [....] A) neither spherical nor chromatic aberration. | ||
* [....] B) chromatic aberration, but not spherical aberration. | * [....] B) chromatic aberration, but not spherical aberration. | ||
- | * [....] C) spherical aberration, but not chromatic aberration. | + | * [ <color green>X</color> ] C) spherical aberration, but not chromatic aberration. |
* [....] D) both spherical and chromatic aberration. | * [....] D) both spherical and chromatic aberration. | ||
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* [....] B) $4.8$ m | * [....] B) $4.8$ m | ||
* [....] C) $4.2$ m | * [....] C) $4.2$ m | ||
- | * [....] D) $-4.2$ m | + | * [ <color green>X</color> ] D) $-4.2$ m |
* [....] E) $5.2$ m | * [....] E) $5.2$ m | ||
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* [....] B) $-36.4$ cm | * [....] B) $-36.4$ cm | ||
* [....] C) $-21.2$ cm | * [....] C) $-21.2$ cm | ||
- | * [....] D) $+36.4$ cm | + | * [ <color green>X</color> ] D) $+36.4$ cm |
* [....] E) $+21.2$ cm | * [....] E) $+21.2$ cm | ||
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====Review question 10==== | ====Review question 10==== | ||
An object is placed in front of a convex mirror at a distance larger than twice the focal length of the mirror. The image will appear | An object is placed in front of a convex mirror at a distance larger than twice the focal length of the mirror. The image will appear | ||
* [....] A) upright and enlarged. | * [....] A) upright and enlarged. | ||
- | * [....] B) upright and reduced. | + | * [ <color green>X</color> ] B) upright and reduced. |
* [....] C) inverted and enlarged. | * [....] C) inverted and enlarged. | ||
* [....] D) inverted and reduced. | * [....] D) inverted and reduced. | ||
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* [....] A) 2.0 | * [....] A) 2.0 | ||
* [....] B) 1.5 | * [....] B) 1.5 | ||
- | * [....] C) 1.0 | + | * [ <color green>X</color> ] C) 1.0 |
* [....] D) 0.25 | * [....] D) 0.25 | ||
* [....] E) 0.5 | * [....] E) 0.5 | ||
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====Review question 12==== | ====Review question 12==== | ||
A vertically polarized beam of light of intensity $100\frac{\text W}{\,{\text m}^2}$ passes through a polarizer with its transmission axis at 40.0$^\circ$ to the vertical. What is the transmitted intensity of this beam of light? | A vertically polarized beam of light of intensity $100\frac{\text W}{\,{\text m}^2}$ passes through a polarizer with its transmission axis at 40.0$^\circ$ to the vertical. What is the transmitted intensity of this beam of light? | ||
- | * [....] A) $58.7\frac{\text W}{\,{\text m}^2}$ | + | * [ <color green>X</color> ] A) $58.7\frac{\text W}{\,{\text m}^2}$ |
* [....] B) $0\frac{\text W}{\,{\text m}^2}$ | * [....] B) $0\frac{\text W}{\,{\text m}^2}$ | ||
* [....] C) $100\frac{\text W}{\,{\text m}^2}$ | * [....] C) $100\frac{\text W}{\,{\text m}^2}$ | ||
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* [....] A) 200 cm | * [....] A) 200 cm | ||
* [....] B) 101 cm | * [....] B) 101 cm | ||
- | * [....] C) 198 cm | + | * [ <color green>X</color> ] C) 198 cm |
* [....] D) 202 cm | * [....] D) 202 cm | ||
* [....] E) 2.0 cm | * [....] E) 2.0 cm | ||
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* [....] C) half as large as his face | * [....] C) half as large as his face | ||
* [....] D) four times as large as his face | * [....] D) four times as large as his face | ||
- | * [....] E) three times as large as his face | + | * [ <color green>X</color> ] E) three times as large as his face |
<color green></color> | <color green></color> | ||
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* [....] B) a short focal length objective and a long focal length eyepiece. | * [....] B) a short focal length objective and a long focal length eyepiece. | ||
* [....] C) a short focal length objective and a short focal length eyepiece. | * [....] C) a short focal length objective and a short focal length eyepiece. | ||
- | * [....] D) a long focal length objective and a short focal length eyepiece. | + | * [ <color green>X</color> ] D) a long focal length objective and a short focal length eyepiece. |
<color green></color> | <color green></color> | ||
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- A lens with a negative focal length. | - A lens with a negative focal length. | ||
- | * <color green>...</color> | + | * <color green>diverging lens</color> |
- A problem in lenses where different colors of light are focused to different focal points. | - A problem in lenses where different colors of light are focused to different focal points. | ||
- | * <color green>...</color> | + | * <color green>chromatic aberration</color> |
- The angle of incidence of light such that after striking a surface the reflected light is completely polarized. | - The angle of incidence of light such that after striking a surface the reflected light is completely polarized. | ||
- | * <color green>...</color> | + | * <color green>Brewster's angle</color> |
- Reflection from a rough surface such that light is sent out in a variety of directions. | - Reflection from a rough surface such that light is sent out in a variety of directions. | ||
- | * <color green>...</color> | + | * <color green>diffuse reflection</color> |
- Light rays converge towards this type of object. The sign convention for the distance to the object in this case is negative. | - Light rays converge towards this type of object. The sign convention for the distance to the object in this case is negative. | ||
- | * <color green>...</color> | + | * <color green>virtual object</color> |
- The ability of a lens to refract light (commonly measured in diopters) | - The ability of a lens to refract light (commonly measured in diopters) | ||
- | * <color green>...</color> | + | * <color green>refractive power</color> |
- A problem in lenses and mirrors of a particular shape where light further away from the principal axis is focused to a different point than light closer to the principal axis. | - A problem in lenses and mirrors of a particular shape where light further away from the principal axis is focused to a different point than light closer to the principal axis. | ||
- | * <color green>...</color> | + | * <color green>spherical aberration</color> |
- The length of this device is the sum of the two focal lengths of the lenses used to make it | - The length of this device is the sum of the two focal lengths of the lenses used to make it | ||
- | * <color green>...</color> | + | * <color green>telescope</color> |
- A property of a material that is related to how fast light travels in the material | - A property of a material that is related to how fast light travels in the material | ||
- | * <color green>...</color> | + | * <color green>index of refraction</color> |
- Colorful object seen in the sky due to the dispersion of light in raindrops. | - Colorful object seen in the sky due to the dispersion of light in raindrops. | ||
- | * <color green>...</color> | + | * <color green>rainbow</color> |
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