NCERT Class VIII Science Solutions: Chapter 16-Light Part 3

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Question 7:

Which of the following statements is correct regarding rods and cones in the human eye?

  1. Cones are sensitive to dim light.

  2. Cones are sensitive to bright light.

  3. Rods are sensitive to bright light.

  4. Rods can sense colour.

Answer: B

Question 8:

In the figure of the human eye, the cornea is represented by the letter

As showing in fig is a human eye

Human Eye

As showing in fig is a human eye

  1. A

  2. B

  3. C

  4. D

Answer: C

VERY SHORT ANSWER QUESTIONS

Question 9:

Name the part of the eye which gives colour to the eyes.

Answer:

Iris.

Question 10:

Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?

Answer:

Persistence of vision

Question 11:

How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?

Answer:

Infinite number of times

Total internal reflection

Total Internal Reflection

Total internal reflection

Question 12:

The angle between incident ray and reflected ray is 60°. What is the value of angle of incidence?

Answer:

Angles in reflection

Angles in Reflection

Angles in reflection

Question 13:

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

Answer:

Formation of image in mirror

Formation of Image in Mirror

Formation of image in mirror

Image of distance between the object and plane mirror.

Image of Distance between the Object and Plane Mirror.

Image of distance between the object and plane mirror.