of the 1. An object is placed 6.5 em from a thin converging lens with a focal le
ID: 1779601 • Letter: O
Question
of the 1. An object is placed 6.5 em from a thin converging lens with a focal length of 14 cm. Which one following statements is correct concerning the image? (a) The image is virtual and 12 cm from the lens. (b) The image is real and 6.0 cm from the lens. (c) The image is real and 3.0 em from the lens. (d) The image is virtual and 6.0 cm from the lens. (e) The image is real and 12 cm from the lens. 2. A diverging lens has a focal length of -15 cm. A 5-cm object is placed 35 em from the lens. h pair of terms most accurately describes the image? (b)Real, inverted (C)Virtual, inverted @virtual.erect (e)Real,smaller erect. Monochromatic light of wavelength 1 is normally incident on a thin film (n=1.40) on glass. In terms of the wavelength, what is the thickness of the thinnest film for which the intensity of the reflected light will be a maximum? (c) 3 fim/4 (e) 3 sim/2 4. In a certain Young's double-slit experiment, an interference pattern is formed on a distant screen. The e is valid. By what angle that located a given bright fringe is small so that the approximation sin factor does the angle change if the wavelength is doubled? (a) The angle increases by a factor of 2. (o) The angle increases by a factor of 4 (c) The angle decreases by a factor of 2. (d) The angle does not change. (e) The angle decreases by a factor of 4. Light passes through a single slit. If the width of the slit is reduced, what happens to the width of the central bright fringe? 5. (a) The central bright fringe becomes narrower, because angle that locates the first dark fringe on either side of the central bright fringe becomes smaller. The central bright fringe becomes narrower, because the angle that locates the first dark fringe on either side of the central bright fringe becomes larger. (e) The width of the central bright fringe does not change, because it depends only on the wavelength d) The central bright fringe becomes wider, because the angle that locates the first dark fringe on (e) The central bright fringe becomes wider, because the angle that locates the first dark fringe on of the light and not on the width of the slit. either side of the central bright fringe becomes larger. either side of the central bright fringe becomes smaller.Explanation / Answer
here,
the object distance , do = 6.5 cm
the focal length , f = 14 cm
let the image distance be di
using the lens formula
1/f = 1/di + 1/do
1/14 = 1/6.5 + 1/di
solving for di
di = - 12 cm
then the answer is (a) the image is virtual and 12 cm from the lens
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