Question

ДАЮ 20 БАЛЛОВ !!!СРОЧНО!!! расстояние между предметом и его изображением равно 0,3 м линейное увеличение равно 2 м определите фокусное расстояние

Answer 1

Дано
f=0,3 м
Г=2
F=?
Решение:
d=f/d=0,3/2=0,15 м
F=d*f/(d+f)=0,2*0,3/(0,2+0,3)=0,06/0,5=0,12 м или 12 см

Answer 2

Calculation of the Focal Length

To determine the focal length, we can use the formula for linear magnification:

Linear Magnification (m) = -v/u

Where: - v is the image distance (distance between the object and its image) - u is the object distance (distance between the object and the lens)

Given that the linear magnification (m) is 2 and the image distance (v) is 0.3 m, we can rearrange the formula to solve for the object distance (u):

u = -v/m

Substituting the given values:

u = -0.3 m / 2

Simplifying the equation:

u = -0.15 m

Now, we can use the lens formula to calculate the focal length (f):

1/f = 1/v - 1/u

Substituting the values:

1/f = 1/0.3 - 1/(-0.15)

Simplifying the equation:

1/f = 3.333 - (-6.667)

1/f = 10

Taking the reciprocal of both sides:

f = 1/10

Therefore, the focal length is 0.1 m.

Please note that the calculations provided are based on the given information and assumptions. If there are any additional details or considerations, please let me know.