1. An object is placed 20 cm in front of a concave mirror of focal length 40 cm.
ID: 1865589 • Letter: 1
Question
1. An object is placed 20 cm in front of a concave mirror of focal length 40 cm. Calculate the image distance and the magnification. An object is placed 25 cm in front of a convex mirror of focal length 30 cm. Calculate the image distance and the magnification. 2. An object of size 5 cm is kept at a distance of 25 cm from the optical center of a converging lens of focal length 10cm. Calculate the distance of the image from the lens and size of the image. 3. 4. A 2.25-cm-tall object is 8.5 cm to the left of a convex lens of 5.5-cm focal length. Find the image position and height. A concave makeup mirror is designed so that a person 25 cm in front of it sees an upright image magnified by a factor of 2. What is the radius of curvature of the mirror? 5.Explanation / Answer
here,
1)
the object distance , do = 20 cm
the focal length of the mirror , f = 40 cm
let the image distance be di
using the mirror formula
1/f = 1/di + 1/do
1/40 = 1/di + 1/20
solving for di
di = - 40 cm
the image distance is - 40 cm
the magnification , m = -di/do
m = - ( - 40)/20
m = 2
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