Question

define lens write an expression for lens formula​

Answer 1

Answer:

The curvature of two optical surfaces are called lens........

$it gives distance of image (v)

$ it gives distance of objects (u)

$it gives focal length (f)

Explanation:

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Answer 2

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✰Question ✰

⋄ Define lens write an expression for lens formula

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✰Answer ✰

➧ A transparent material bounded by two surface of which at least one is called is called lens.

➧ Most lenses used in spectales, magnifying glasses ,cameras and microscope have at least one spherical surface.

➧ In some case ,cylindrical lenses are used in spectacles.

⋄ The expression for lens formula ⋄

➧ 1/u-1/v= 1/f

here u is the image distance

v is the object distance

f is the focal length.

⋄ To calculate magnification by lens ⋄

➧ m= v/u