1.) A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal

Question

1.) A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal length f of 100 cm

(Is f positive or negative?) Where is the image formed?

a.) 80 cm behind the mirror

b.) 25 cm behind the mirror

c.) 17 cm behind the mirror

d.) 17 cm in front of the mirror

e.) 25 cm in front of the mirror

2.) A + 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. What is the size of the image and is it upright or inverted?

a.) 1.0 cm upright,

b.) 3.8 cm, inverted

c.) 2.4 cm, inverted

d.) 15 cm, upright

e.) 12 cm, upright

3.) Imagine placing an upright pencil very far away from a lens with positive focal length, and imagine to move it move closer and closer to the lens, eventually the pencil will reach the lens. What happens to pencil

Explanation / Answer

1) C

2) D

3) A

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