Choose the correct option.

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

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Both convex lens and concave lens have a positive focal length.

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

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Both convex lens and concave lens have a negative focal length.

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Solution

The correct option is C
Convex lens has positive focal length and concave lens has a negative focal length.

Focus of converging or convex lens is at the right hand side of the lens, hence focal length is positive.

Focus of diverging or concave lens is at the left hand side of the lens, hence focal length is negative.

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Similar questions

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

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. A combination of convex and concave lenses has power

4 D

.If the convex lens has power

5 D

focal length of the concave lense will be

Q. We combined a convex lens of focal length and

f_{1}

concave lens of focal length

f_{2}

and their combined focal length was F. The combination of these lenses will be have like a concave lens, if :

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(d) A concave lens of focal length 5 cm

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