numericlight7-18

numericlight7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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TYPICAL NUMERIC QUESTIONS FOR PHYSICS I REGULAR QUESTIONS TAKEN FROM CUTNELL AND JOHNSON LIGHT AND OPTICS 1. A ray of light is reflected from two plane mirror surfaces as shown in the figure. What are the correct values of α and β ? Value of α Value of β A) 26° 26° B) 26° 64° C) 38° 52° D) 52° 26° E) 64° 26° 2. An object is placed 1 m in front of a plane mirror. An observer stands 3 m behind the object. For what distance must the observer focus his eyes in order to see the image of the object? A) 1 m B) 2 m C) 3 m D) 4 m E) 5 m 3. The focal length of a spherical concave mirror is 20 cm. What is its radius of curvature? A) 5 cm B) 10 cm C) 20 cm D) 40 cm E) 50 cm 4. The radius of curvature of a spherical convex mirror is 50 cm. What is its focal length? A) +25 cm B) 25 cm C) +50 cm D) 50 cm E) +100 cm Page 1
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5. A concave mirror has a radius of curvature of 30 cm. How close to the mirror should an object be placed so that the rays travel parallel to each other after reflection? A) 10 cm B) 15 cm C) 30 cm D) 45 cm E) 60 cm 6. A concave mirror in an amusement park has a radius of curvature of 4.0 m. A child stands in front of the mirror so that she appears 2.5 times taller than her actual height.
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numericlight7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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