A person needs a lens of power $- 4.5 D$ for correction of her vision.

$(a)$ What kind of defect in vision is she suffering from?

$(b)$ What is the focal length of the corrective lens?

$(c)$ What is the nature of the corrective lens?

Important Questions on The Human Eye and Colourful World

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 19

How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 20

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also, indicate the order of the colours of the spectrum obtained.

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 21

Is the positions of a star as seen by us its true positions? Justify your answer.

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 22

Why do we see a rainbow in the sky only after rainfall?

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 23

Why is the colour of the clear sky blue?

MEDIUM

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 24

What is the difference in colours of the sun observed during sunrise/sunset and noon? Give explanation for each.

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 25

Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?

HARD

10th CBSE

IMPORTANT

ESSENTIALS OF PHYSICS CLASS X>Chapter 2 - The Human Eye and Colourful World>NCERT Exemplar Problems>Q 26

When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?