Q. why a covex lens has always +ve power and a concave lens always -ve power.... Give two appropriate reasons....
Q. Define 1 dioptre....
Q. Differentiate between a concave lens and a concave lens....
Q. State the criterias for placing a lens in a cartesian plane....
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Answers
Answer:
1.The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as concave lens has a negative focal length. It is because focal length of convex lens is +ve and. ... Therefore power of convex lens is positive.The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
2.One dioptre is the power of the lens whose focal length is 1m. Note – To solve this problem you need to know that the power of the lens is reciprocal of its focal length.
Explanation:
3.Difference Between Convex and Concave Lenses
Convex Lens Concave Lens
A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre.
Due to the converging rays, it is called a converging lens. Due to the diverging rays, it is called a diverging lens.
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