Geometrical optics
 1. Geometrical optics is a branch of optics that studies the behavior of light in terms of rays and the principles of reflection and refraction. It simplifies the study of light by assuming that light travels in straight lines and interacts with surfaces according to certain rules. Geometrical optics is concerned with the formation of images by lenses and mirrors, understanding how light rays are bent or focused by optical elements, and predicting the paths of light rays in various optical systems. This branch of optics is essential for designing and understanding optical devices such as cameras, telescopes, microscopes, and eyeglasses. Geometrical optics provides a practical and intuitive way to analyze and manipulate light, making it a foundational concept in the field of optics.What is the focal length of a concave lens?A) UndefinedB) PositiveC) NegativeD) Zero2. What happens to the image distance if an object is moved closer to a converging lens?A) The image distance decreasesB) The image becomes blurryC) The image distance remains the sameD) The image distance increases3. What type of image is formed by a concave mirror when the object is located inside the focal point?A) Virtual and uprightB) Real and uprightC) Real and invertedD) Virtual and inverted4. What does the term 'total internal reflection' refer to?A) Reflection of light at a 45-degree angleB) Refraction of light when entering a different mediumC) Reflection of light at an interface when the angle of incidence is greater than the critical angleD) Dispersion of light through a prism5. What type of mirror is used in a magnifying glass?A) Convex mirrorB) Spherical mirrorC) Plane mirrorD) Concave mirror6. Which type of lens diverges light?A) Convex lensB) Plano-concave lensC) Concave lensD) Double convex lens7. What happens to the light rays when passing through a converging lens?A) They form a parallel beamB) They converge to a pointC) They diverge away from the lensD) They reflect off the lens8. In what direction does light bend when it enters a medium of higher refractive index?A) Parallel to the surfaceB) In a spiral motionC) Away from the normalD) Towards the normal
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