**18. Light starts in a medium of index of refraction n1, passes into a medium of index n2, where n2 > n1, and finally passes into air.** The diagram accompanying the text shows a rectangular box segmented into three layers, representing different media through which light travels. The topmost layer is labeled "air," the middle layer is labeled "n2," and the bottom layer is labeled "n1." **Details of the Diagram:** - The bottom segment (`n1`) is shaded differently to indicate a unique medium with a refractive index `n1`. - The middle segment (`n2`) is also shaded and represents another medium with a refractive index `n2`, which is greater than `n1`. - Above these two segments is the unshaded segment labeled "air." **Diagram Explanation:** - **Light Path A:** This arrow represents the path of light as it moves through the media and bends due to the change in refractive index from `n1` to `n2` and then from `n2` to air. - **Light Path B to E:** Similar paths are drawn to show the light bending at different angles as it passes through the different layers. The label options for the question and the answers choices are: **A. A** **B. B** **C. C** **D. D** **E. E** Students are likely asked to identify which path corresponds to the correct description of how light refracts when transitioning between these indices of refraction. Understanding Snell's Law \( (n1 \cdot \sin(\theta1) = n2 \cdot \sin(\theta2)) \) would be critical in answering this question correctly.
Ray Optics
Optics is the study of light in the field of physics. It refers to the study and properties of light. Optical phenomena can be classified into three categories: ray optics, wave optics, and quantum optics. Geometrical optics, also known as ray optics, is an optics model that explains light propagation using rays. In an optical device, a ray is a direction along which light energy is transmitted from one point to another. Geometric optics assumes that waves (rays) move in straight lines before they reach a surface. When a ray collides with a surface, it can bounce back (reflect) or bend (refract), but it continues in a straight line. The laws of reflection and refraction are the fundamental laws of geometrical optics. Light is an electromagnetic wave with a wavelength that falls within the visible spectrum.
Converging Lens
Converging lens, also known as a convex lens, is thinner at the upper and lower edges and thicker at the center. The edges are curved outwards. This lens can converge a beam of parallel rays of light that is coming from outside and focus it on a point on the other side of the lens.
Plano-Convex Lens
To understand the topic well we will first break down the name of the topic, ‘Plano Convex lens’ into three separate words and look at them individually.
Lateral Magnification
In very simple terms, the same object can be viewed in enlarged versions of itself, which we call magnification. To rephrase, magnification is the ability to enlarge the image of an object without physically altering its dimensions and structure. This process is mainly done to get an even more detailed view of the object by scaling up the image. A lot of daily life examples for this can be the use of magnifying glasses, projectors, and microscopes in laboratories. This plays a vital role in the fields of research and development and to some extent even our daily lives; our daily activity of magnifying images and texts on our mobile screen for a better look is nothing other than magnification.
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