Persistance of Vision

Q. Newton's colour disc is made by painting the constituent colours of white light in the same order and proportion. In which colour the disc appear when rotated very fast?

1. White
2. Black
3. Blue
4. Red

Q.

The sensation of seeing an object remains for about _____ of a second after the object is removed from the view.

1. $\frac{1}{12}$

2. $\frac{1}{16}$

3. $\frac{1}{8}$

4. $\frac{1}{10}$

Q.

A disc is painted as in the figure below. It is rotated very fast as indicated by the direction of the arrow. What will be the colour of the disc?

1. Magenta

2. Cyan

3. White

4. Purple

Q. Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.

Q. define Newtons colour disc briefly

Q. The ability of eyelens to change its to form sharp images is called the power of accommodation.

1. texture
2. focal length
3. colour

Q. The vertical field of view for a single-eyed human (in degrees) is:

1. 120
2. 150
3. 180
4. 90

Q.

In the process of light entering our eye and forming an image at retina, at which interface the maximum refraction takes place?

1. At air - cornea interface

2. At cornea- aqueous humour interface

3. At lens - vitreous humour interface

4. At pupil - lens interface

Q.

The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This ability of eye is known as

1. presbyopia

2. accomodation

3. near-sightedness

4. power