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Q.

A convex lens forms an image of magnification –2 and height 6 cm. The height of the object is:


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a

6cm

b

4cm

c

2cm

d

3cm 

answer is D.

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Detailed Solution

The height of the object is 3 cm.
Given:
The height of image = 6 cm
Magnification  = –2
we know
Magnification is defined as
 m=height of imageheight of object
 Then
 height of object=height of image magnification
 height of object=6 2
       = 3 cm
 
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A convex lens forms an image of magnification –2 and height 6 cm. The height of the object is: