Reflection, refraction and lenses

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Question 41

Easy

Figure 1 shows a student setup using a converging lens on an optical bench to project a sharp, real image of an illuminated crosswire onto a screen.

An optical bench setup showing an illuminated object on the left, a converging lens in the middle, and a white screen on the right showing a focused image. The distance from the object to the lens is marked as a. The distance from the lens to the screen is marked as b.

The student measures the following distances:

Distance from the object to the lens, $30\text{ cm}$
Distance from the lens to the screen (image), $15\text{ cm}$

Calculate the focal length, $f$ , of the lens.

Use the equation:

\frac{1}{f} = \frac{a+b}{a \times b}

[3]

Reflection, refraction and lenses

Question 41

Reflection, refraction and lenses Questions

Reflection, refraction and lenses

Question 41

Reflection, refraction and lenses Questions