An object is held 2.4 cm away from a lens.The lens has a focal length of 43.6cm.

Question

An object is held 2.4 cm away from a lens.The lens has a focal length of 43.6cm.

a.) Determine the image distance.
1 cm

b.) Determine the magnification.
2

c.) If the object is 5.3 cm long,determine the image height.
3 cm

d.) Which of the followingare true about the image? Choose all that apply. 4 The image is inverted.
The image is virtual.
The image is upright.
The image is real.


e.) Which of the followingare true about the lens? Choose all that apply. 5 The lens is concave.
The lens is converging.
The lens is diverging.
The lens is convex. 4 The image is inverted.
The image is virtual.
The image is upright.
The image is real.
4 The image is inverted.
The image is virtual.
The image is upright.
The image is real.
4 5

Explanation / Answer

   Given    objectdistance      u   =   -2.4   cm,   focallength   f      =   43.6   cm,   imagedistance   =   v    a.   1/f   =   1/v   -   1/u          1/v   =   1/43.6   +   1/(-2.4)   =   - 0.394          v   =   1/(-0.394)   =   -2.54   cm    b.   magnification   m   =   -v / u   =   -(-2.54) / (-2.4)   =   - 1.05    c.   m   =  - I/ O       Height ofimage   I   =    1.05* 5.3   =   -5.56   cm    d.   The image is virtual   (m is -ve)          The image is upright  ( Iis + ve)

   e.    The lens is converging          The lens is convex.
             The lens is convex.
   

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