Convex lens has positive focal length and concave lens has a negative focal length.

True

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False

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Solution

The correct option is A True

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Similar questions

Why focal length of convex mirror and convex lens is positive while concave mirror and concave lens negative?

Why are the focal lengths of convex and concave lens , considered positive and negative respectively ?

Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
(c) A concave lens has 4 dioptre power having a focal length 0.25 m.
(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

Q. According to the sign convention for lenses, a concave lens has a negative focal length.

with repect to the type of lens or mirror used, when is the focal length taken negative or positive?

For ex:- if a concave lens has a focal length of 15 cm, will it be take positive or negative while using the lens formula?

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