Axel wants to take a break from his school work to go outside and burn small holes in leaves with a lens. He will need to ...

Question

BlackTom AI · Accepted Answer

Examining what Axel needs to do to burn small holes in leaves with a lens involves checking each statement for its relevance to using a lens to focus sunlight.
Option 1: 'hold the lens perpendicular to the sun's rays' — The sun emits mostly parallel rays. Positioning the lens so that the rays pass straight through and are well-centered on the lens helps produce a clean, focused image of the sun on a target. While the exact term can be phrased in different ways, the key idea is that the rays should pass through the lens without oblique incidence that would misalign the focus. So, holding the lens with its optical axis aligned to the sun (effectively perpendicular to the direction of the sun’s rays) supports proper focusing. This makes the statement arguably true in practical terms.
Option 2: 'all of them' — If all the individual statements can be true, then this option is correct. Exploring the rest of the options will determine whether every statement is consistent with using a lens to start a fire with sunlight.
Option 3: 'hold the lens one focal length away from the leaf' — To burn something with a lens, you typically place the target at the focal point of the lens so that the converging rays meet and form a small, intense spot. Practically, placing the leaf about one focal length away from the lens ensures the focused image of the sun converges onto the leaf, creating heat that can burn. This is a standard setup for solar concentration.
Option 4: 'use a converging lens' — A converging (convex) lens is required to bring parallel sunlight to a focus. A diverging lens would spread the light and would not produce the sharp, high-intensity spot needed to burn the leaf. Therefore, using a converging lens is correct.
Putting it together, the combination of using a converging lens, placing the leaf roughly at the focal distance, and aligning the lens with the sun’s rays to achieve a sharp focus all align with the method for concentrating sunlight to burn a target. Since each of the separate statements aligns with the practical requirements of solar focusing, the option asserting 'all of them' captures the complete, correct approach.

Axel wants to take a break from his school work to go outside and burn small holes in leaves with a lens. He will need to ...单项选择题

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