An object is 5.25 cm in front of a concave mirror with focal length 3.0 cm. Wher

Question

An object is 5.25 cm in front of a concave mirror with focal length 3.0 cm.     Where is the image?

A) 13 cm from the mirror

B) 7.0 cm from the mirror

C) 4.3 cm from the mirror

D) 3.3 cm from the mirror

An object is 5.25 cm in front of a concave mirror with focal length 3.0 cm.      What is its magnification?

A) 0.33

B) 1.33

C) 0.33

d) -1.33

An object is placed 15 cm from a concave mirror of focal length 30 cm. The object is 4.0 cm tall.  How tall is the image?

A) 1.0 cm

B) 2.0 cm

C) 8.0 cm

16 cm

A) 13 cm from the mirror

B) 7.0 cm from the mirror

C) 4.3 cm from the mirror

D) 3.3 cm from the mirror

An object is 5.25 cm in front of a concave mirror with focal length 3.0 cm.      What is its magnification?

A) 0.33

B) 1.33

C) 0.33

d) -1.33

An object is placed 15 cm from a concave mirror of focal length 30 cm. The object is 4.0 cm tall.  How tall is the image?

A) 1.0 cm

B) 2.0 cm

C) 8.0 cm

16 cm

Explanation / Answer

Given:
p = 5.25 cm
f = 3 cm

Req'd:
q

Sol'n:
q = pf/(p-f)
.....where: q = image distance; f = focal distance; p = object distance
q = (5.25*3)/(5.25-3)
q = 7 cm

2. magnification = -v/u = -7/5.25 = -1.33

3: u=15cm

f=30cm

1/v=1/f-1/u= 1/30

v= 30 cm

m= -v/u=hi/hu

hi=-30*4/15=8 cm

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