The human eye and the colourful world Worksheet-2

The human eye and the colourful world Worksheet-2

 

  1. Colour blind person may have

A. normal vision 

B. defective vision

C. sometimes normal and sometimes defective vision

D. cannot say

 

  1. Focal length of eye lens is

A. fixed

B. variable

C. sometimes fixed and sometimes variable

D. cannot say

 

  1. Variable focal length of eye lens is responsible for

A. accommodation of eye

B. persistence of vision

C. colour blindness

D. least distance of distinct vision

 

  1. Far point of normal human eye is

A. 25 cm            B. 25 m              C. 500 m            D. infinity

 

  1. Near point of normal human eye is

A. 25 cm            B. 25 mm           C. 25 m              D. not fixed

 

  1. When ciliary muscles are relaxed, focal length of eye lens is

A. maximum 

B. minimum

C. neither maximum nor minimum

D. cannot say

 

  1. A concave lens of suitable focal length is used for correcting a

A. myopic eye

B. hypermetropic eye

C. Myopic and hypermetropic eye

D. none

 

  1. White light is made up of

A. seven colours                            B. six colours                      

C. all colours                                 D. no colour

 

  1. Splitting of white light into seven colours on passing through a glass prism is called

A. Reflection                                  B. Refraction

C. Scattering                                  D. Dispersion

 

  1. Which of the colours of visible light has minimum wavelength ?

A. violet              B. red                  C. yellow            D. green

 

Answer Key:

  1. C

Explanation: Colour blindness is independent of the defects of vision.

  1. B
  2. A

Explanation: Accommodation of eye is due to variable focal length of eye lens.

  1. D
  2. A
  3. A

Explanation: When ciliary muscles are relaxed, eye lens is thin and its focal length is maximum.

  1. A
  2. A
  3. D
  4. A

Explanation: Violet colour has least wavelength.