Short Answer Questions
1. Draw ray diagrams each showing (i) myopic eye and (ii) hypermetropic eye.
2. A student sitting at the back of the classroom cannot read clearly theletters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.
3. How are we able to see nearby and also the distant objects clearly?
4. 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?
5. How will you use two identical prisms so that a narrow beam of whitelight incident on one prism emerges out of the second prism as white light? Draw the diagram.
6. 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. Alsoindicatethe order of the colours of the spectrum obtained
7. Is the position of a star as seen by us its true position? Justify youranswer.
8. Why do we see a rainbow in the sky only after rainfall?
9. Why is the colour of the clear sky blue?
10. What is the difference in colours of the Sun observed during sunrise/sunset and noon?
Give explanation for each.
Long Answer Questions
1. Explain the structure and functioning of Human eye. How are we able to seenearby as well as distant objects?
2. 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?
3. Explain the refraction of light through a triangular glass prism using a labelled ray
diagram. Hence define the angle of deviation.
4. How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
5. Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
6. How does refraction take place in the atmosphere? Why do stars twinkle but not the planet
1. Draw ray diagrams each showing (i) myopic eye and (ii) hypermetropic eye.
2. A student sitting at the back of the classroom cannot read clearly theletters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.
3. How are we able to see nearby and also the distant objects clearly?
4. 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?
5. How will you use two identical prisms so that a narrow beam of whitelight incident on one prism emerges out of the second prism as white light? Draw the diagram.
6. 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. Alsoindicatethe order of the colours of the spectrum obtained
7. Is the position of a star as seen by us its true position? Justify youranswer.
8. Why do we see a rainbow in the sky only after rainfall?
9. Why is the colour of the clear sky blue?
10. What is the difference in colours of the Sun observed during sunrise/sunset and noon?
Give explanation for each.
Long Answer Questions
1. Explain the structure and functioning of Human eye. How are we able to seenearby as well as distant objects?
2. 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?
3. Explain the refraction of light through a triangular glass prism using a labelled ray
diagram. Hence define the angle of deviation.
4. How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
5. Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
6. How does refraction take place in the atmosphere? Why do stars twinkle but not the planet
