Question

Choose true or false for each statement regarding concave mirrors.
true false  A concave mirror produces an enlarged real image when the object is placed far beyond its focal point (Region 1).
true false  If an object is placed 4.1 cm from a concave mirror with f = 4 cm, then its image will be reduced and virtual.
true false  If an object is placed 7.9 cm from a concave mirror with f = 4 cm, then its image will be enlarged and real.

Tries 0/2

Choose true or false for each statement regarding convex mirrors.
true false  A convex mirror produces a reduced real image when the object is placed between the mirror and its focal point (Region 3).
true false  If an object is placed 7.9 cm from a convex mirror with f = 4 cm, then its image will be reduced and real.
true false  If an object is placed 3.9 cm from a convex mirror with f = 4 cm, then its image will be reduced and real.

Tries 0/2

Choose true or false for each statement regarding the sign conventions for mirrors.
true false  The focal length f is positive for convex mirrors.
true false  Virtual images appear behind a mirror and have a positive value for the image distance.
true false  The magnification m is negative for upright images.

Answer 1

For the following answers, real positive sign convention is used.

1) A concave mirror produces an enlarged real image when the object is placed far beyond its focal point.

False.

Since when the object is placed far beyond its focal point, image will be diminished ,inverted and real.

2)If an object is placed 4.1 cm from a concave mirror with f = 4 cm, then its image will be reduced and virtual.

False.

Image distance ,and magnification is

Image formed will be real, enlarged and inverted.

3)If an object is placed 7.9 cm from a concave mirror with f = 4 cm, then its image will be enlarged and real.

True

Image distance and magnification is

Image formed will be real, enlarged (slightly) and inverted.

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For convex mirrors the image formed will be reduced, virtual and upright in all the cases.

4)A convex mirror produces a reduced real image when the object is placed between the mirror and its focal point

False

It cannot form a real image.

5) If an object is placed 7.9 cm from a convex mirror with f = 4 cm, then its image will be reduced and real.

False.

It cannot form a real image.

6) If an object is placed 3.9 cm from a convex mirror with f = 4 cm, then its image will be reduced and real.

False.

It cannot form a real image.

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7)The focal length f is positive for convex mirrors.

False

Focal length of convex mirror is negative.

8) Virtual images appear behind a mirror and have a positive value for the image distance.

False

Image distance for the virtual distance is negative.

9)The magnification m is negative for upright images.

False

Magnification is positive for upright images and negative for inverted images.

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