Question

What is the formula for magnification obtained with a lens?

a) Ratio of height of image to height of object

b) Double the focal length.

c) Inverse of the radius of curvature​

Answer 1

magnification formula (M= v/u) for lenses

a. The ratio of the height of an image to the height of an object is known as magnification

B. Double convex lenses have focal points on both sides of the lens; these and the points at twice the focal length are used to locate objects and images. When the object is outside 2F, the image will be between F and 2F on the other side and will be inverted, diminished, and real.

C. The radius of curvature of a curve at a point M(x,y) is called the inverse of the curvature K of the curve at this point: R=1K. Hence for plane curves given by the explicit equation y=f(x), the radius of curvature at a point M(x,y) is given by the following expression: R=[1+(y′(x))2]32|y′′(x)|.

Answer 2

Ans:-

a) Ratio of Height of image to height of object.

M= Hi/Ho

(where- Hi is height of image and

Ho is height of object)

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