Question

explain defect of lens. what are the methods to minimize them? Full explanation. ​

Answer 1

Answer:

Lens maker's formula is derived on the assumptions that incident rays are paraxial and aperture of the lens is small.

Object may be extended and need not have point size always.

Due to dispersion, the focal length of the lens changes with color.

Explanation:

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Answer 2

Answer:

• Lens maker's formula is derived on the assumptions that incident rays are paraxial and aperture of the lens is small.
• Object may be extended and need not have point size always.
• Due to dispersion, the focal length of the lens changes with color.

Explanation:

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