A converging lens has a focal length of 78.00 cm. A 15.0 cm tall object is locat

Question

A converging lens has a focal length of 78.00 cm. A 15.0 cm tall object is located 185.0 cm in front of this lens.

(a) What is the image distance?
cm
(b) Is the image real or virtual?

realvirtual    

(c) What is the image height? Be sure to include proper algebraic sign.
cmA converging lens has a focal length of 78.00 cm. A 15.0 cm tall object is located 185.0 cm in front of this lens.

(a) What is the image distance?
cm
(b) Is the image real or virtual?

realvirtual    

(c) What is the image height? Be sure to include proper algebraic sign.
cm

Explanation / Answer

1)

a) using formula

1/f = 1/di + 1/do

1/di = 1/78 - 1/185

di = 134.85 cm

b)

image is real.

c)

- di/do = hi/ho

hi = (134.85/185)*15 = 10.93 cm

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