Worksheet - Human Eye

 Human Eye - Solved Worksheet

1. In human eye the image is formed on - 

a) Cornea 

b) Pupil 

c) Iris 

d) Retina

Answer: d

2. The amount of light entering the eye is controlled by 

a) Iris 

b) Pupil 

c) Cornea 

d) Ciliary muscle

Answer: b

2. In human eye the image is formed on - 

a) Cornea 

b) Pupil 

c) Iris 

d) Retina

Answer: d

3. The ability of eye lens to adjust the focal length is called as 

a) Reflection 

b) Refraction 

c) Accommodation 

d) Dispersion

Answer: c

4. The ability of eye lens to adjust the focal length is called as 

a) Reflection 

b) Refraction 

c) Accommodation 

d) Dispersion

Answer: c

5. The common type of bi-focal lenses which consist of both concave and convex lenses are used to correct the defect called as 

a) Hypermetropia 

b) Myopia 

c) Presbyopia 

d) None

Answer: c

6. The phenomenon of scattering of light by colloidal particles gives rise to 

a) Reflection 

b) Refraction 

c) Blue colour of sky 

d) Tyndall effect

Answer: d

7. The splitting of white light into its constituent’s colours is called as 

a) Diffraction of light 

b) Dispersion of light 

c) Scattering of light 

d) Interference of light

Answer: b

8. The twinkling of stars is due to - 

a) Scattering of light 

b) Refraction of light through atmosphere 

c) Dispersion of light 

 d) Tyndall effect

Answer: b

9. Planets do not twinkle because 

a) They are point source of light 

b) Huge source of light 

c) They didn’t acts as a point source of light 

d) Both b and c

Answer: d

10. The least distance of distinct vision for a young adult with normal vision is 

a) 30 cm 

b) 20 cm 

c) 25 cm 

d) 15 cm

Answer: c

11. The far point of the normal eye is - 

a) 20 m 

b) 25 m 

c) 25cm 

d) Infinity

Answer: d

12. The _____ causes partial or complete loss of vision 

a) Myopia 

b) Hypermetropia 

c) Cataract 

d) Presbyopia

Answer: c

13. The angle through which all the coloured light get deviated from prism is called 

a) Angle of dispersion 

b) Angle of scattering 

c) Angle of refraction 

d) Angle of deviation

Answer: d

14. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because, among all other colours, the red light 

(a) is scattered the most by smoke or fog 

(b) is scattered the least by smoke or fog 

(c) is absorbed the most by smoke or fog 

 (d) moves fastest in the air

Answer: b

15. Which of the following phenomena of light are involved in the formation of a rainbow? 

(a) Reflection, refraction and dispersion 

(b) Refraction, dispersion and total internal reflection 

(c) Refraction, dispersion and internal reflection 

(d) Dispersion, scattering and total internal reflection

Answer: b

16. A person sees an object closer to his eyes. What changes will take place in his eyes? 

(a) the pupil size will expand 

(b) the ciliary muscles will contract 

(c) the focal length of the eye lens will increase 

(d) the light entering the eye will be more

Answer: b

17. The image shows a light ray incident on a glass prism. The various angles are labeled in the image. Which angle shows the angle of incidence and angle of refraction, respectively? 

(a) A and D 

(b) B and E 

(c) C and F 

 (d) D and F

Answer: a

18. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? 

(a) Dispersion of light 

(b) Scattering of light 

(c) Total internal reflection of light 

(d) Reflection of light from the earth

Answer: b

19.

The image shows the dispersion of the white light in the prism. What will be the colours of the X, Y and Z? 

(a) X: red; Y: green; Z: violet 

(b) X: violet; Y: green; Z: red 

(c) X: green; Y: violet; Z: red 

(d) X: red; Y: violet; Z: green

Answer: b

20. Which image shows the deviation of light in a prism?

Answer: b

21. . The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light. 

(a) dispersion 

(b) scattering 

(c) interference 

(d) Tyndall effect

Answer: b

22. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because, among all other colours, the red light 

(a) is scattered the most by smoke or fog 

(b) is scattered the least by smoke or fog 

(c) is absorbed the most by smoke or fog 

(d) moves fastest in the air

Answer: b

23. A person gets out in the sunlight from a dark room. How does his pupil regulate and control the light entering the eye? (a) The size of the pupil will decrease, and less light will enter the eye (b) The size of the pupil will decrease, and more light will enter the eye (c) The size of the pupil will remain the same, but more light will enter the eye (d) The size of the pupil will remain the same, but less light will enter the eye

Answer: a

24. Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight. (a) Isaac Newton (b) Einstein (c) Kepler (d) Hans Christian Oersted

Answer: a

25. When white light enters a glass prism from air, the angle of deviation is least for (a) blue light (b) yellow light (c) violet light (d) red light

Answer: d