"Physics" - Chapter 5 - "Light"

Light

is an energy that helps us to see anything

Types of objects

Luminous and Non-Luminous

Two sources of light

Artificial and Natural

Name the three lines that fall on the same plane

Incident ray , Normal and Reflected ray

Laws of reflection

1) The angle of incidence = angle of reflection

2) The incident ray, the reflected ray, and the normal all lie in the same plane

Image form by a plane mirror

1.) Virtual and Upright

2.) Erect

3.) Same size

4.) Same distance

5.) Laterally inverted

Reflection types

Regular and Diffused reflection

Regular reflection

occurs when parallel rays of light hit a smooth surface

Diffused reflection

occurs when parallel rays of light hit a rough surface and all reflect at different angles

Multiple reflection

When an reflected ray get reflected

Name the two types of nerves Retina have

Rods and Cones

Which nerve in Retina senses colour

Cones

Nerves sensitive to bright light

Cones

Nerve sensitive to dim light

Rods

The place where the Optic nerve and the retina have no-?

Sensory nerves

We can't see images on one spot, what is it called?

Blind spot

The image stays in our eyes for

1/16 th of a second

The movie's images move at

24 pictures a second

The most comfortable distance between eye and book is

25cm

The Braille system was made by whom and in which year?

In 1932 , by Louis Braille