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Chapter 24: Problem 52

Which of the following statements is correct? (a) A virtual image can be seen by a man but it cannot be photographed (b) A real image can be seen by a man but it cannot be photographed (c) A real image can be seen by a man and can be photographed by a camera (d) A virtual image cannot be seen by a man but it can be photographed

Short Answer

Expert verified
The correct statement is (c).

Step by step solution

01

Understanding Images

First, we need to understand what real and virtual images are. A real image is formed when light converges and can be captured on a screen or film. It can be seen and photographed. A virtual image, however, is formed when light rays appear to diverge from an apparent source and cannot be projected onto a screen, but it can be seen by looking into the device (like a mirror or lens), and can also be photographed by focusing a camera onto it.
02

Analyzing Statement (a)

Statement (a) says, "A virtual image can be seen by a man but it cannot be photographed." While a virtual image can be seen, it can also be photographed by a camera. Hence, this statement is incorrect.
03

Analyzing Statement (b)

Statement (b) says, "A real image can be seen by a man but it cannot be photographed." This is incorrect because a real image can be both seen directly and photographed.
04

Analyzing Statement (c)

Statement (c) says, "A real image can be seen by a man and can be photographed by a camera." This is correct as both seeing and photographing a real image are possible.
05

Analyzing Statement (d)

Statement (d) says, "A virtual image cannot be seen by a man but it can be photographed." This is incorrect because a virtual image can be seen directly by looking into the device that forms it.
06

Conclusion

From the analysis, the correct statement is (c): "A real image can be seen by a man and can be photographed by a camera."

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Real Image
A real image is formed when light rays actually converge at a point. When you use a lens or mirror to focus light, it brings the rays together, creating an image that can be cast on a screen. This is because the light physically arrives at a location to form the image.
  • The image is real because the light meets and forms it in reality.
  • Because it appears in a physical location, this type of image can be captured on photographic film or a digital sensor.
Unlike virtual images, real images can be viewed directly without needing a device, since they exist where the light focuses. Examples include the image formed on a movie screen by a projector or the focused sunlight through a magnifying glass.
Virtual Image
Virtual images occur when light rays diverge, or spread out, but appear to the eye to come from a particular point. These images are not formed by the actual meeting of light rays, but by their apparent path when extended backwards to a point.
  • The image appears to be in the mirror or lens but is not emitted in that spot physically.
  • Though it can't be projected onto a screen, it can still be seen by looking into the optical device creating it, like a flat mirror.
Virtual images are often mistaken for unreal because they can鈥檛 be touched, yet they can still be photographed by a camera pointed at the location where it looks like the image exists. A classic example is the image you see in a bathroom mirror.
Image Formation
The formation of images, whether real or virtual, involves the interaction of light with surfaces or optical devices like mirrors and lenses. To form an image, light rays must interact with such surfaces in ways that redirect them to meet (for a real image) or appear to meet (for a virtual image).
  • Real images form on the opposite side of the lens from the object being viewed.
  • Virtual images form on the same side as the object, appearing within the optical element.
Understanding the behaviors of light and its directional changes, through reflection or refraction, is key to predicting how and where images will form.
Light Convergence
Light convergence refers to the process by which light rays come together, or converge, typically using a converging lens or concave mirror. This is essential in forming real images, as it involves directing scattered or parallel rays to a single focal point.
  • Converging lenses like convex lenses are used in focusing light to form clear images, essential for cameras and telescopes.
  • Fun fact 鈥� your eyes also use converging mechanisms to focus light on the retinas!
Through convergence, different rays of light are unified, leading to the formation of an observable and capturable real image on a second surface, like a screen.
Diverging Light Rays
Diverging light rays spread out from a point and are associated with the formation of virtual images. When these rays are redirected, especially by using a diverging lens or a convex mirror, they give the illusion of finding their origin at a specific location.
  • Diverging lenses, such as concave lenses, are used to spread light, making them useful in altering the perception of the image location.
  • This gives rise to virtual images that seem to exist within the lens or mirror.
Understanding diverging rays is crucial for various applications, including those designed to widen fields of view or create specific visual effects using optical devices like peepholes and fisheye lenses.

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Most popular questions from this chapter

Two plane mirrors are arranged at right angles to each other as shown in figure. A ray of light is incident on the horizontal mirror at an angle \(\theta\). For what value of \(\theta\) does the ray emerges parallel to the incoming ray after reflection from the vertical mirror? (a) \(60^{\circ}\) (b) \(30^{\circ}\) (c) \(45^{\circ}\) (d) All of these

The focal length of the objective lens of a telescope is \(30 \mathrm{~cm}\) and that of its eye lens is \(3 \mathrm{~cm}\). It is focussed on a scale 2 metre distant from it. The distance of the objective lens from the eye lens to see with relaxed eye is (a) \(33 \mathrm{~cm}\) (b) \(65.3 \mathrm{~cm}\) (c) \(38.3 \mathrm{~cm}\) (d) \(40.3 \mathrm{~cm}\)

Concave and convex lenses are placed touching each other. The ratio of magnitudes of their power is \(2: 3\). The focal length of the system is \(30 \mathrm{~cm}\). Then the focal lengths of individual lenses are (a) \(-75,50\) (b) \(-15,10\) (c) 75,50 (d) \(75,-50\)

The plane face of a plano-convex lens is silvered. If \(\mu\) be the refractive index and \(R\), the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature (a) \(\mu \mathrm{R}\) (b) \(R /(\mu-1)\) (c) \(R^{2} \mu\) (d) \([(\mu+1) /(\mu-1)] R\)

A beam of light consisting of red, green and blue colours is incident on a right-angled isosoles prism. The refractive indices of the material of the prism for the above red, green and blue wavelengths are \(1.39,1.44\) and \(1.47\) respectively. The prism will (a) separate part of the red colour from the green and blue colours (b) separate part of the blue colour form the red and green colours (c) separate all the three colours from one another (d) not separate even partially any colour from the other two colours
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