Question

Hold a concave mirror in our hand and direct its reflecting surface to the sun. Direct the light reflected by the mirror onto a sheet of paper held close to the mirror. Move the sheet of paper back and forth gradually until the paper sheet finds a sharp spot of light. Holding the mirror and the paper in the same position for a few minutes produces a burn, producing smoke. 1.1) The distance between the paper sheet and the concave mirror gives an idea of a rough measurement of a) Aperture b) Focal length c) Radius of curvature d) None of the above 1.2) A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object, when the image is virtual, will be a) 22.5 cm b) 7.5 cm c) 30 cm d) 45 cm 1.3) Which of the following does not describe a ray that can be drawn for a concave mirror? a) An incident ray through the mirror's center, reflecting right back through the center. b) An incident ray through the center point, reflecting right back through the focal point. c) An incident ray through the focal point, reflecting parallel to the principal axis d) An incident ray parallel to the principal axis, reflecting through the focal point. 1.4) A concave mirror of radius of 30 cm is placed in water. Its focal length in air and water differ by a) 15 cm b) 20 cm c) 30 cm d) 0 cm. 1.5) An object is placed at 10 cm in front of a concave mirror of radius of curvature 15 cm. The position of the image, nature, and magnification of the image is a) Image distance = 30 cm from the mirror on the same side as the object, nature is real and inverted and magnified b) Image distance = 30 cm from the mirror on the other side as the object, nature is virtual and erect and magnified c) Image distance = 30 cm from the mirror on the same side as the object, nature is real and inverted and diminished d) Image distance = 30 cm from the mirror on the same side as the object, nature is real and erect and magnified.

Hold a concave mirror in our hand and direct its reflecting surface to the sun. Direct the light reflected by the mirror onto a sheet of paper held close to the mirror. Move the sheet of paper back and forth gradually until the paper sheet finds a sharp spot of light. Holding the mirror and the paper in the same position for a few minutes produces a burn, producing smoke.

1.1) The distance between the paper sheet and the concave mirror gives an idea of a rough measurement of a) Aperture b) Focal length c) Radius of curvature d) None of the above

1.2) A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object, when the image is virtual, will be a) 22.5 cm b) 7.5 cm c) 30 cm d) 45 cm

1.3) Which of the following does not describe a ray that can be drawn for a concave mirror? a) An incident ray through the mirror's center, reflecting right back through the center. b) An incident ray through the center point, reflecting right back through the focal point. c) An incident ray through the focal point, reflecting parallel to the principal axis d) An incident ray parallel to the principal axis, reflecting through the focal point.

1.4) A concave mirror of radius of 30 cm is placed in water. Its focal length in air and water differ by a) 15 cm b) 20 cm c) 30 cm d) 0 cm.

1.5) An object is placed at 10 cm in front of a concave mirror of radius of curvature 15 cm. The position of the image, nature, and magnification of the image is a) Image distance = 30 cm from the mirror on the same side as the object, nature is real and inverted and magnified b) Image distance = 30 cm from the mirror on the other side as the object, nature is virtual and erect and magnified c) Image distance = 30 cm from the mirror on the same side as the object, nature is real and inverted and diminished d) Image distance = 30 cm from the mirror on the same side as the object, nature is real and erect and magnified.

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