10th Class Physics Chapter 5 Test14. Optics

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The center point through which the principal axis passes in a lens is called:
   1. Focal point
   2. Optical center
   3. Curvature center
   4. Normal
2. The distance from the lens to its focal point is called:
   1. Principal axis
   2. Optical center
   3. Focal length
   4. Curvature
3. The apparent flattening of the Sun at the dawn and dusk is due to phenomenon of:
   1. Refraction
   2. Reflection
   3. Dispersion
   4. Polarization
4. The two types of photoreceptor cells in the retina are:
   1. Cones and optic nerve
   2. Pupil and iris
   3. Rods and cones
   4. Retina and cornea
5. The science of light and its interaction with matter is called:
   1. Physics
   2. Optics
   3. Astronomy
   4. Mathematics
6. Reflection from a rough surface is called:
   1. Diffused reflection
   2. Specular reflection
   3. Multiple reflection
   4. Total reflection
7. The image formed by a magnifying glass is:
   1. Real, inverted, enlarged
   2. Virtual, erect, enlarged
   3. Real, erect, diminished
   4. Virtual, inverted, diminished
8. The term “Einstein ring” is related to:
   1. Total internal reflection
   2. Refraction of light
   3. Gravitational lensing
   4. Dispersion of light
9. Which medium property helps in achieving total internal reflection?
   1. Both media have same refractive index
   2. Rarer medium has greater refractive index
   3. Denser medium has greater refractive index
   4. None of these
10. Which part of the optical fiber has higher refractive index?
    1. Cladding
    2. Core
    3. Jacket
    4. Outer layer