MEDIUM
10th CBSE
IMPORTANT
Earn 100

Explain with the help of diagram why the sun is visible to us two minutes before the actual sunrise and two minutes after the sunset.

Important Questions on Human Eye and Colourful World

MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 1

A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases after dispersion does the third colour from the top correspond to the colours of the sky?

MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 8
What is "dispersion of white light"? Draw a labelled diagram to illustrate the recombination of the spectrum of white light. Why is it essential that the two prisms used for the purpose should be identical and placed in an inverted position with respect to each other?
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 9
Give reasons: The sky appears dark instead of blue to an astronaut in space.
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 9
Give reasons: The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise.
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 9
Give reasons: The stars appear to twinkle.
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 10

Write the functions of each of the following parts of the human eye:

  1. Cornea                                                                                                                                                                                 
  2. Iris
  3. Crystalline (Eye) lens
  4. Ciliary muscles                                                                                                                                                                     
  5. Retina
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 10
A person is unable to see distinctly the objects closer than 1 m. Name the defect of vision he is suffering from. Draw ray diagrams to illustrate the cause of the defect and its correction by suitable lens.
MEDIUM
10th CBSE
IMPORTANT
Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 11 - Human Eye and Colourful World>SELF-ASSESSMENT TEST>Q 11
A person is unable to see distinctly the words printed on a newspaper. Name the defect of vision he is suffering from. Draw ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.