Question

difference between concave lens and convex lens
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Answer 1

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$\fbox{Difference between concave and convex lens}$

Concave lens :

• Lenses that are thicker around their edges and thinner at the centre are called concave lenses.
• They are known as diverging lenses.
• They have negative focal length.
• It diverges the incident rays away from the principal axis.
• Image formed is always virtual and diminished.
• Used to cure myopia(near sightedness)

Convex lens :

• Lenses that are thinner around their edges and thicker at the centre are called concave lenses.
• They are known as converging lens.
• They have positive focal length.
• It converges incident ray towards principal axis.
• Different types of image formed depending upon position of object.
• Used to cure hypermetropia (far sightedness)