The focal length of a concave lens is:

negative when image formed is real

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always positive

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always negative

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positive when image formed is real

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Solution

The correct option is C
always negative

According to the sign convention, the focal length of concave lens is always negative.

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Similar questions

Only one of the following applies to a concave lens. This is : (a) focal length is positive (b) image distance can be positive or negative (c) height of image can be positive or negative (d) image distance is always negative

Q. A concave lens always forms a real image.

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Q. Find out the correct option from the following.
(a) The magnification is positive for all virtual images and is negative for all real images.
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Q. Image formed by a concave lens is always ________________.

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The focal length of a concave lens is:

The correct option is C always negative According to the sign convention, the focal length of concave lens is always negative.

The correct option is C
always negative

According to the sign convention, the focal length of concave lens is always negative.