Splitting of white light into seven colors is known as:
- a) Reflection
- b) Refraction
- c) Dispersion
- d) Diffusion
(Correct Answer: c)
The human eye lens is:
- a) Concave
- b) Convex
- c) Flat
- d) None of the above
(Correct Answer: b)
Which instrument uses multiple reflections to create patterns?
- a) Microscope
- b) Kaleidoscope
- c) Periscope
- d) Telescope
(Correct Answer: b)
Which of these is a luminous object?
- a) Moon
- b) Sun
- c) Earth
- d) Mirror
(Correct Answer: b)
III. True or False
- Light travels in straight lines. (True)
- Reflection occurs only on smooth surfaces. (False)
- A plane mirror produces a real image. (False)
- The angle of reflection depends on the surface material. (False)
- A virtual image cannot be seen directly. (False)
- The retina of the eye contains rods and cones. (True)
- The blind spot in the eye has no sensory cells. (True)
- Dispersion is the bending of light through a lens. (False)
- Night blindness is caused due to a deficiency of vitamin A. (True)
- Images in a kaleidoscope are formed due to refraction. (False)
Short Questions
- State the laws of reflection.
- What is lateral inversion?
- Explain the role of the retina in the human eye.
- Differentiate between regular and diffused reflection.
- Why is it advised not to look directly at the Sun?
Long Questions
- Describe the construction and working of a kaleidoscope.
- Draw a labeled diagram of the human eye and explain its parts.
- What is dispersion of light? Explain with an activity.
- How are visually impaired persons able to read and write using the Braille system?
- Explain how the angle of incidence and angle of reflection are related, and provide an activity to verify this relationship.