Very Short Answers - Light, Science, Class 8 Notes | Study Science Class 8 - Class 8

Class 8: Very Short Answers - Light, Science, Class 8 Notes | Study Science Class 8 - Class 8

The document Very Short Answers - Light, Science, Class 8 Notes | Study Science Class 8 - Class 8 is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8

 Q1. What makes things visible?

 Light.

Q2. Can you see an object in the dark?

No.

Q3. What is a mirror?

A smooth and shiny surface is called a mirror.MirrorMirror

Q4. What kind of image is formed by a plane mirror?

Virtual and erect image.

Q5. Where is the image formed by a plane mirror?

Behind the mirror. 

Q6. Where does the image form in our eyes?

At Retina. 

Q7. Where is no image formed?

Blindspot.

Q8. For what time the image stays on the retina?

About 1/16th of a second.

Q9. Which bird is called night bird?

Owl is called night bird. 

Q10. Which surface shows regular reflection?

Smooth or regular surface.

Q11. Which surface shows diffused reflection?

Rough or irregular surface.

Q12. What is the size of the image formed in a plane mirror?

Same size of the object.

Q13. How many mirrors are used in Kaleidoscope?

Three mirrors.

Q14. How many colours are there in the spectrum of light?

Seven colours.

Q15. How many colours are there in white light?

Seven colours.

Q16. What is the shape of the human eye?

Spherical shape.

Q17. What is the front transparent part of the eye called?

Cornea.

Q18. What is the small opening in the iris called?

Pupil.

Q19. Which part of the eye is controlled by the iris?

Pupil.

Q20. What is the coloured part of the eye called?

Iris.

Q21. What is the function of the iris?

Iris controls the amount of light entering the eye through the pupil.

Q22. Which part of the body sends the sensation felt to the brain?

Nerve cells.

Q23. How many kinds of nerve cells are there in the retina?

Two (cones and rods).

Q24. Which cells of the retina are sensitive to bright light and colour?

Cones.

Q25. Which cells of the retina are sensitive to dim light?

Rods.

Q26. What is the distinct vision of the normal eye?

25 cm.

Q27. Who invented the system of reading for blind men?

Braille.

Q28. Which element is used at the back of plane mirror?

Silver

Q29. The distance between the object and its image formed by a plane mirror appears to be 18 cm. What is the distance between mirror and the object?

9 cm

Q30. A ray of light is incident on a mirror at an angle of 40°. What is the angle of reflect?

40°

Q31. Name a device which works on the principle of multiple reflection.

Periscope

Q32. Can we see an object in the dark?

No

Q33. What is the nature of the image formed by the plane mirror?

Virtual and erect

Q34. Where is the image formed in a plane mirror?

Behind the mirror

Q35. Give an example of night bird.

Owl

Q36. What do we call the image that cannot be obtained on a screen?

Virtual

Q37. How many colours are there in a spectrum of white light?

Seven

Q38. Name the spot inside the human eye where the image is not visible.

Blind spot

Q39. Name the liquid found between the cornea and lens.

Aqueous humour

Q40. Name the liquid found between the lens and the retina.

Vitreous humour

The document Very Short Answers - Light, Science, Class 8 Notes | Study Science Class 8 - Class 8 is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8
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