Which of the following is true about concave lenses-Focal length is positive-Image distance can be positive or negative-Height of image can be positive or negativeImage distance is always negative

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Standard X

Physics

Sign Convention for Lens

Which of the ...

Question

Which of the following is true about concave lenses?

Focal length is positive

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Image distance can be positive or negative

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Height of image can be positive or negative

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Image distance is always negative

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Solution

The correct option is D Image distance is always negative
(d) image distance is always negative
As discussed in the sign convention, all distances measured to the left of the optical centre of the lens are taken to be negatrive. Thus, the object distance for a concave lens is always negative.

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One of the following does not apply to a concave mirror. This is : (a) focal length is negative (b) image distance can be positive or negative (c) image distance is always positive (d) height of image can be positive or negative

Q. Giving reasons, state the 'signs' (positive or negative) which can be given to the following:

(a) object distance (u) for a concave mirror or convex mirror
(b) image distance (v) for a concave mirror
(c) image distance (v) for a convex mirror

Q. 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

Is the focal length, image distance and object distance positive or negative for the concave and convex lenses?

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Which of the following is true about concave lenses?

The correct option is D Image distance is always negative(d) image distance is always negative As discussed in the sign convention, all distances measured to the left of the optical centre of the lens are taken to be negatrive. Thus, the object distance for a concave lens is always negative.

The correct option is D Image distance is always negative
(d) image distance is always negative
As discussed in the sign convention, all distances measured to the left of the optical centre of the lens are taken to be negatrive. Thus, the object distance for a concave lens is always negative.