Just want to double check my answers. Any help would beappreciated. A concave mi

Question

Just want to double check my answers. Any help would beappreciated.

A concave mirror, with focal lengthmagnitude f (in air), is placed perpendicular to the x-axis at theposition x = 0. This problem asks questions about various objectsplaced at different x-positions. x < -f is Region I; -f < x< 0 is Region II; 0 < x < f is Region III; f < x isRegion IV. The objects are all real objects.

Recall the shape of a concave mirror:

1)  For the object shown, ray(s)_______ is/are drawn incorrectly and ray(s) _______ is/are drawncorrectly. (Remember it is a concavemirror!)

2)  If an object is in Region I, theimage will _______ be larger than the object (|M| > 1).

3)  If an object is in Region II, theimage will be _______ and _______.

4)  If the mirror is placed in water(n = 1.33), the magnitude of the focal length will _______.

5)  If this problem was abouta converging lens (made of glass with n= 1.5), the answer to question #4 would be

Explanation / Answer

1) Only 3 is correct (rays do not pass thru themirror) 2) sometimes 3) virtual, erect 4) focal length remains same - light does not pass betweenmedia with different indices of refraction 5) increase - if the lens were made of air the focal lengthwould be infinite

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