Question

Определить фокусное расстояние собирающей линзы, если предмет находиться на расстоянии 10 см от линзы а изображение получено на расстоянии 15 см от линзы? плиз помогите срочно!!!!

Answer 1

Фокусное расстояние определяется по формуле 
F= f*d/(f+d)
F=10*15/(10+15)=6 см

Answer 2

Determining the Focal Length of a Convex Lens

To determine the focal length of a converging (convex) lens, we can use the lens formula:

1/f = 1/v - 1/u

Where: - f is the focal length of the lens - v is the image distance from the lens - u is the object distance from the lens

In this case, the object distance (u) is 10 cm and the image distance (v) is 15 cm.

Substituting these values into the lens formula, we can solve for the focal length (f):

1/f = 1/15 - 1/10

To simplify the calculation, we can find the least common multiple (LCM) of 15 and 10, which is 30:

1/f = (2/30) - (3/30)

1/f = -1/30

Now, we can take the reciprocal of both sides to find the focal length (f):

f = -30 cm

Therefore, the focal length of the converging lens is -30 cm.

Please note that the negative sign indicates that the lens is converging (convex).