A concave cosmetic mirror has a focal length of 36cm . A 5.0cm -long mascara bru
ID: 2124484 • Letter: A
Question
A concave cosmetic mirror has a focal length of 36cm . A 5.0cm -long mascara brush is held upright 18cm from the mirror..
A)Use ray tracing to determine the location of its image. q=___________cm B) Use ray tracing to determine the height of its image.h=______cm C) Is the image upright or inverted? D) Is the image real or virtual?2) A 5.4ft -ft-tall girl stands on level ground. The sun is 30? above the horizon. A) How long is her shadow? l=_____ft A)Use ray tracing to determine the location of its image. q=___________cm B) Use ray tracing to determine the height of its image.h=______cm C) Is the image upright or inverted? D) Is the image real or virtual?
2) A 5.4ft -ft-tall girl stands on level ground. The sun is 30? above the horizon. A) How long is her shadow? l=_____ft
Explanation / Answer
1)
a) q=36cm
b) h=10cm
c) upright image
d)virtual image
2)
altitude=5.4 ft
angle=30 degrees
formula:
tan 30=altitude/base
base=altitude/tan 30
base=5.4/tan 30
and
Length of her shadow is 9.353 ft
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