1. Mark the following statements about lenses as true or false. True False Incid

Question

1. Mark the following statements about lenses as true or false.

True False Incident parallel light rays converge if the lens’s focal length is negative.

True False If the path of converging light rays is traced backward, the rays appear to come from a point called the focal point.

True False A double convex lens has a negative focal length.

True False The focal length of a lens is always positive.

2. A double convex lens is made from glass with an index of refraction of n = 1.50. The magnitudes of its radii of curvature R1 and R2 are 10.0 cm and 15.0 cm, respectively. What is the focal length of the lens? Show your work. f = cm

3. What is a real image? What is a virtual image?

4. For a diverging lens, state what kinds of images can be formed and the conditions under which those images can be formed.

Explanation / Answer

1.

(a) false: Incident parallel light rays sre not converge whenthe lens’s focal length is negative..

(b) true: the light rays appear to come from a point called the focal point when the path of converging light rays is traced backward,

(c) False: the statement ''A double convex lens has a negative focal length'' is not true.

(d) False: the given statement is false, because the focal length of convex lens is Positive and for a concave lens is negative.

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