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Ray Optics & Optical Instruments - NEET

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FAQs on Ray Optics & Optical Instruments - NEET

1. What is ray optics?
Ans. Ray optics, also known as geometrical optics, is a branch of optics that studies the behavior of light using the concept of rays. It considers light as a straight line path or ray, and it explains various phenomena such as reflection, refraction, and image formation using simple geometric principles.
2. What are optical instruments?
Ans. Optical instruments are devices that use the principles of optics to manipulate light for various purposes. They are used for imaging, measuring, and analyzing light. Examples of optical instruments include microscopes, telescopes, cameras, and spectrometers.
3. How does reflection occur in ray optics?
Ans. Reflection in ray optics occurs when light rays encounter a surface and bounce back. The angle of incidence, which is the angle between the incident ray and the normal to the surface, is equal to the angle of reflection, which is the angle between the reflected ray and the normal. This follows the law of reflection.
4. What is refraction in ray optics?
Ans. Refraction in ray optics is the bending of light as it passes from one medium to another with a different refractive index. This bending occurs due to the change in the speed of light. The amount of bending depends on the angle of incidence and the refractive indices of the two media, and it follows Snell's law.
5. How do optical instruments work?
Ans. Optical instruments work based on the principles of reflection, refraction, and image formation. They use lenses, mirrors, and other optical components to manipulate light rays in order to form magnified or focused images. The specific working mechanism of each instrument depends on its design and purpose.
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