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Q.

What is the formula for magnification obtained with a lens?


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a

Ratio of height of image to height of object.

b

Double the focal length.

c

Inverse of object distance.

d

Inverse of radius of curvature. 

answer is A.

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Detailed Solution

The ratio of height of image to height of object is the formula for magnification obtained with the lens.
“Magnification is defined as the ratio of the image's height to the object's height. It can also be defined as the ratio of the image distance (v) to the object distance (u).” Mathematically,
 m = height of image height of object=vu
 
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What is the formula for magnification obtained with a lens?