The radius of curvature of a spherical concave mirror is 20 cm. Describe the ima

Question

The radius of curvature of a spherical concave mirror is 20 cm. Describe the image formed when a 10-cm-tall object is positioned from the following distances. For each case give the image distance, the image height, the type of image (real or virtual), and the orientation of the image (upright or inverted). (Indicate the direction with the sign of your answer.)The radius of curvature of a spherical concave mirror is 20 cm. Describe the image formed when a 10-cm-tall object is positioned from the following distances. For each case give the image distance, the image height, the type of image (real or virtual), and the orientation of the image (upright or inverted). (Indicate the direction with the sign of your answer.)

(a) Calculate the focal length. (Enter NONE if a particular answer does not exist.)

(b) Is this answer unique?

Yes, there is only one possible focal length.

No, there are two possible focal lengths.    

(c) Is the image real or virtual?

The image is real.

The image is virtual.   

Both images are real.

Both images are virtual.

One image is real and the other is virtual.

The image is neither real nor virtual.

(d) If the object is 10 cm tall, determine the height of the image(s).

Explanation / Answer

a) we knoe, f = R/2 = 20/2 = 10 cm

b) Yes, there is only one possible focal length.

c) object distance is not specified in the given question.

if the object distance is greater than f, the image is real

if the object distance is less than f, the image is virtual

d) need object distance to calculate image height.

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