Question

Выручайте!!!Чему равно фокусное расстояние плосковыпуклой стеклянной линзы в скипидаре ,если радиус кривизны ее выпуклой поверхности 25 см? Показатель преломления скипидара 1,47.

Answer 1

$\frac{1}{F}=(n-1)(\frac{1}{R})$

$\frac{1}{F}=(1.47-1)(\frac{1}{0.25})$

1/F=1.88

F=0.53 м = 53 см.

Ответ: 53 сантиметра.

 

 

Answer 2

Calculating the Focal Length of a Plano-Convex Lens

To calculate the focal length of a plano-convex lens, we can use the lens maker's formula, which is given by:

\[ \frac{1}{f} = (n - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \]

Where: - \( f \) = focal length of the lens - \( n \) = refractive index of the material of the lens - \( R_1 \) = radius of curvature of the first surface of the lens - \( R_2 \) = radius of curvature of the second surface of the lens

Given: - Radius of curvature of the convex surface, \( R_1 = 25 \, \text{cm} \) - Refractive index of the material, \( n = 1.47 \)

Let's calculate the focal length using the given values.