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