QUIZ ON LIGHT

 QUIZ ON LIGHT

1. A 14-year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him.

- Name the defect of vision he is suffering from.

A.Near sightedness

B.Far sightedness

C.Both A & D

D.Myopia

2. A 14-year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him.

- where is the image position in his case.

A.After the retina

B.Before retina

C.On retina

D.Behind the lens

3. A 14-year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him.

- which lens should doctor prescribe him in this case

A.Convex lens

B.Concave lens

C.Both A & B

D.Plano concave lens

4.Study the diagram given below and answer the questions that follow it:

Which defect of vision is represented in this case? 

A.Long sightedness

B.Far sightedness

C.Hypermetropia 

D.All of the above

5.Study the diagram given below and answer the questions that follow it:what could be two causes of this defect

A.Eye ball becomes smaller , focal length increased  

B.Eye ball becomes larger , focal length increased 

C.Eye ball becomes smaller , focal length decreased

D.Eye ball becomes larger , focal length decreased 

6.Study the diagram given below and answer the questions that follow it:Which lens should be prescribed to this patient? 

A.Convex lens

B.Concave lens

C.Both A & B

D.Plano concave lens

7.

[A] 1-b, 2-c, 3-a, 4-d 

[B] 1-d, 2-a, 3-b, 4-c 

[C] 1-b, 2-d, 3-c, 4-a 

[D] 1-a, 2-c, 3-d, 4-b 

 8.How eyes adjust in order to focus the image of near or distant objects on retina?

(a) The lens moves in or out according to the position of the object

(b) The retina moves in or out according to the position of the object

(c) The lens becomes thicker or thinner according to the position of the object

(d) The pupil gets larger or smaller according to the position of the object

9.A got his eye tested. The optician’s prescription for the spectacles was:Left eye: −3 D,Right eye: −3.50 D

The person is having a defect of vision called:

(a) Presbyopia

(b) Myopia

(c) Astigmatism

(d) Hypermetropia

10. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? 

A.60cm

B.1/60 cm

C.-60 cm

D.30 cm

11.A concave lens has focal length of 20 cm. Object placed 60 cm for the lens which is  5 cm tall . it forms an image at 15 cm from the lens.calculate the size of the image formed

A.5/4 cm

B.4/5 cm

C.-4/5 cm

D.-5/4 cm

12.For which of the following cases will the total internal reflection of light be possible?

[A] Angle of incidence is less than the critical angle.

[B] Angle of incidence is equal to the critical angle.

[C] Angle of incidence is greater than the critical angle. 

[D] Angle of incidence is equal to the angle of refraction. 

13.Which colour of light has the minimum velocity in the glass prism?

[A] Red 

[B] Green 

[C] Blue

[D] Violet 

13.Which colour of light has the minimum velocity in the glass prism?

[A] Red 

[B] Green 

[C] Blue

[D] Violet 

15.Which of the following statements is true?

[A] Pupil controls the amount of light entering the eye. 

[B] Pupil helps in changing the focal length of the eye lens. 

[C] Cornea controls the size of the pupil. 

[D] Ciliary muscles change the size of the retina. 

16.The milky or cloudy layer formed on the eye lens of a person is called...

[A] iris

[B] cataract 

[C] glaucoma 

[D] presbyopia 

17.The deflection of light by minute particles and molecules in all direction is called _____ of light.

[A] dispersion 

[B] interference 

[C] diffraction 

[D] scattering