Class 8 Science Light Question Answers
Q: What is the primary condition for seeing an object?
A: Light coming from the object must enter our eyes. We cannot see objects in complete darkness.
Q: What are the two laws of reflection?
A:
The angle of incidence is equal to the angle of reflection
The incident ray, reflected ray, and normal at the point of incidence lie in the same plane
Q: What is the difference between regular and diffused reflection?
A: Regular reflection occurs on smooth surfaces like mirrors, where parallel rays reflect in a uniform direction. Diffused reflection happens on rough surfaces, where parallel rays reflect in different directions.
Q: What is lateral inversion?
A: Lateral inversion is when the left side of an object appears on the right side in a mirror image, and vice versa.
Q: What are the main parts of the human eye?
A: The main parts are cornea, iris, pupil, lens, retina, and optic nerve.
Q: What is the blind spot?
A: The blind spot is the point on the retina where the optic nerve joins, which has no sensory cells and cannot detect light.
Q: What are cones and rods in the eye?
A:
Cones are sensitive to bright light and color
Rods are sensitive to dim light
Q: What causes night blindness?
A: Lack of vitamin A in the diet can cause night blindness.
Q: What is dispersion of light?
A: Dispersion is the splitting of white light into its constituent colors, which can be observed through a prism or in a rainbow.
Q: What is a kaleidoscope?
A: A kaleidoscope is an optical instrument using multiple mirrors to create beautiful, changing patterns when viewed through a small hole.
