Image Formation by Lenses

• A

• B

• C

• D

Where should the object placed in front of a convex lens for it to get the image as same size of object if the focal length of the convex lens is f.

• 2f

• f

• 3f

• 4f

Which of the diagram below shows the correct ray diagram of a convex lens?

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Which of the drawing for concave lens is correct?

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Which diagram shows the correct path of light ray?

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an object is placed at a distance of 20cm from a convex lens which has a focal length of 15cm. Which of the following correctly shows the characteristics of the image formed?

• Real, inverted, diminished

• Real, inverted, magnified

• Virtual, upright, magnified

• Virtual, upright, diminished

The characteristics of the image formed by a concave lens is

• Real inverted, diminished

• Real, inverted, magnified

• Virtual, upright, magnified

• Virtual, upright, diminished

The power of a lens is -2.5D. Which of the following bellow is correct?

• Convex lens f=20cm

• Concave lens f=40cm

• Concave lens f=20cm

• Convex lens f=40cm

An object is placed at a distance of u from a convex lens with focal length,f. The object distance,u is varied to produce different images. Which characteristics of image formed is true?

• u<f, virtual, upright, magnified

• f<u<2f, real, inverted, diminished

• u=2f, real, inverted, magnified

• u>2f, real, inverted, same size

An object is placed at a distance of u>2f from a convex lens will produce a image

• Real, inverted, magnified

• Real, inverted, diminish

• Virtual, upright, diminish

• Virtual, upright, magnified