- 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) Positive
B) Negative
C) Undefined
D) Zero
- 2. What happens to the image distance if an object is moved closer to a converging lens?
A) The image distance decreases
B) The image distance remains the same
C) The image becomes blurry
D) The image distance increases
- 3. What type of image is formed by a concave mirror when the object is located inside the focal point?
A) Virtual and inverted
B) Virtual and upright
C) Real and inverted
D) Real and upright
- 4. What type of mirror is used in a magnifying glass?
A) Concave mirror
B) Plane mirror
C) Convex mirror
D) Spherical mirror
- 5. What does the term 'total internal reflection' refer to?
A) Reflection of light at a 45-degree angle
B) Dispersion of light through a prism
C) Reflection of light at an interface when the angle of incidence is greater than the critical angle
D) Refraction of light when entering a different medium
- 6. What happens to the light rays when passing through a converging lens?
A) They reflect off the lens
B) They diverge away from the lens
C) They converge to a point
D) They form a parallel beam
- 7. Which type of lens diverges light?
A) Double convex lens
B) Concave lens
C) Plano-concave lens
D) Convex lens
- 8. In what direction does light bend when it enters a medium of higher refractive index?
A) Towards the normal
B) Parallel to the surface
C) Away from the normal
D) In a spiral motion
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