4) The image formed by a biconvex lens is the same size as the object when: a) t

Question

4) The image formed by a biconvex lens is the same size as the object when:

a) the object is at infinity

b) the object is at focal point

c) the object is at the center of curvature

d) when the image is at infinity

5) In the case of a biconvex lens, when you place an object at F:

a) a real image is formed

b) a virtual image is formed

c) no image is formed

6) Which of the following statements is true?

a) M of a biconvex lens is always negative

b) M of a biconcave lens is always negative

c) |M| is always less than one for a biconvex lens

d) |M| is always less than one for a biconcave lens

Explanation / Answer

4)

c) the object is at the center of curvature

If a lens is biconvex, a beam of light travelling parallel to the lens axis and passing through the lens will be focused to a spot on the axis, at a certain distance behind the lens (i.e. the focal length). In this case, the lens is called a positive or converging lens

6)
b) M of a biconcave lens is always negative

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