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| 1 | |
Describe the image of an object positioned 20 cm from a concave spherical mirror of radius 60 cm. |
| | A) | virtual, erect, 60 cm in front of mirror, magnified 3 times |
| | B) | virtual, erect, 60 cm behind mirror, magnified 3 times |
| | C) | virtual, erect, 60 cm behind mirror, magnified -3 times |
| | D) | virtual, erect, 12 cm behind mirror, magnified 3 times |
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| 2 | |
An object 7.0 cm high is placed 15 cm from a convex spherical mirror of radius 45 cm. Describe its image. |
| | A) | virtual, erect, 9.0 cm behind mirror, 4.2 cm high |
| | B) | virtual, erect, 45.0 cm behind mirror, 4.2 cm high |
| | C) | virtual, erect, 9.0 cm behind mirror, 0.6 cm high |
| | D) | virtual, inverted, 9.0 cm behind mirror, 4.2 cm high |
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| 3 | |
What is the focal length of a convex spherical mirror which produces an image one-sixth the size of an object located 12 cm from the mirror? |
| | A) | 1.7 cm |
| | B) | -2.4 cm |
| | C) | 10.3 cm |
| | D) | 4.0 cm |
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| 4 | |
The speed of light in a certain glass is 1.91 x 108 m/s. What is the refractive index of the glass? |
| | A) | 1.57 |
| | B) | 0.64 |
| | C) | 1.09 |
| | D) | 4.9 |
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| 5 | |
A beam of light strikes the surface of water at an incidence angle of 60°. Determine the directions of the reflected and refracted rays. For water, n=1.33. |
| | A) | (a) 30° reflected into air, (b) 22° refracted into water |
| | B) | (a) 60° reflected into air, (b) 41° refracted into water |
| | C) | (a) 90° reflected into air, (b) 60° refracted into water |
| | D) | (a) 41° reflected into air, (b) 30° refracted into water |
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| 6 | |
The critical angle for light passing from rock salt into air is 40.5°. Calculate the index of refraction of rock salt. |
| | A) | 1.54 |
| | B) | 0.65 |
| | C) | 0.025 |
| | D) | 1.32 |
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| 7 | |
A luminous object and a screen are 12.5 m apart. What are the position and focal length of the lens which will throw upon the screen an image of the object magnified 24 times? |
| | A) | (a) 0.50 m from object, (b) +0.48 m |
| | B) | (a) 0.54 m from object, (b) +0.52 m |
| | C) | (a) 12.5 m from object, (b) 12.5 m |
| | D) | (a) 0.54 m from object, (b) +2.1 m |
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| 8 | |
The index of refraction for a certain type of glass is 1.640 for blue light and 1.605 for red light. When a beam of white light (one that contains all colors) enters a plate of this glass at an incidence angle of 40°, what is the angle in the glass between blue and red parts of the refracted beams. |
| | A) | 0.53° |
| | B) | 23.075° |
| | C) | 0.009° |
| | D) | 46.692° |
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| 9 | |
What are the nature and focal length of the lens that will form a real image having one-third the dimensions of an object located 9.0 cm from the lens? |
| | A) | diverging, -4.50 cm |
| | B) | converging, +2.25 cm |
| | C) | converging, +13.5 cm |
| | D) | converging, +6.75 cm |
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| 10 | |
Describe fully the image of an object which is 10 cm high and 28 cm from a diverging lens of focal length -7.0 cm. |
| | A) | virtual, erect, smaller, 5.6 cm in front of lens, 2.0 cm high |
| | B) | virtual, inverted, smaller, 9.3 cm in front of lens, 3.3 cm high |
| | C) | virtual, erect, larger, 5.6 cm in front of lens, 20.0 cm high |
| | D) | real, inverted, smaller, 5.6 cm in front of lens, 2.0 cm high |
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