Question

An object is placed 5 cm in front of a concave mirror that has a focal length of 15 cm. The high of object is 4 cm. Calculate magnification of image, high of image and describe the image's characteristics!

Answer 1

Jawaban:

diketahui

s = 5 cm

f = 15 cm

h = 4 cm

ditanya

M=?

h'=?

sifat bayangan =?

jawab

1/f = 1/s + 1/s'

1/15 = 1/5 + 1/s'

1/15 - 1/5 = 1/s'

1/15 - 3/15 = 1/s'

-2/15 = 1/s'

s' = - 15/2 = - 7,5 cm (dibelakang cermin)

M = s'/s

= 7,5/5

M = 1,5 kali

h'/h = s'/s

h'/4 = 7,5/5

h' = 7,5/5 x 4

h' = 6 cm

sifat = maya, tegak, diperbesar

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