Worksheet 10 Light Important Q/A @ CBSE @NEET Exam 100 % Success

 LIGHT 

REFLECTION AND REFRACTION

1. Write down four important characteristics of image formed by a plane mirror.

Ans: Image is virtual, erect, laterally inverted and same size as object.

2. Define the following terms in relation to concave spherical mirror:

a. Pole

b. Centre of curvature

c. Radius of curvature

d. Principal focus

e. Principal axis

f. aperture

g. Focal length

Ans: 

a. Pole: The mid point of the mirror is known as Pole.

b. Centre of curvature: The centre of curvature of a spherical mirror is the centre of that sphere of which mirror is a part.

c. Radius of Curvature: The distance between pole and centre of curvature is called radius of curvature of the mirror.

d. Principal Focus: The point on the axis of a mirror to which parallel rays of light converge or from which they appear to diverge after reflaction.

e. Principal axis: The straight line passing through the pole and the center of curvature of the spherical mirror is called the principal axis of a spherical mirror.

f. Aperture: That portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror. In fact, aperture of a mirror represents the size of the mirror.

g. Focal Length: The focal length of a spherical mirror is defined as the distance from the primary focus to its pole.

3. How is hypermetropia corrected?

Ans: It is corrected by using convex lens.

4. How is myopia corrected?
Ans: It is corrected by using concave lens.

5. What is yellow spot?

Ans: It is highly light sensitive spot for seeing things with highest clearness.

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

Ans: Virtual

7. Show mathematically, the first law of reflection.
Ans: ∠i = ∠r

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

Ans: Blind spot

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

Ans: Aqueous humour

10. Name the liquid found between the lens and the retina.
Ans: Vitreous humour

Ashwani Kumar

ashwanikmr82@gmail.com