LIGHT

which of the following gives the formation of a real image most of the times?

• convex lens

• plane mirror

• concave lens

• convex mirror

Images in a plane mirror are

• real

• larger

• same size

• smaller

Why can you see most objects? 

• they emit light
• light refracts through them
• light reflects off them
• They absorb light

At the junction of the optic nerve and the retina,there are no sensory cells , so no vision is visible at the spot , it is ___________________

• cornea

• blind spot

• sensory nerve

• retina

On a smooth surface,The angle of reflection is always equal to____________________.

There are two types of reflection. They are:

• Regular

• Diffused

• Ray

• non regular

Explain the phenomena depicted in the following diagram?(not more than 30 words)

Answer explanation

Dispersion of light- The splitting of light into its component colours.

in the rainbow formation it has two components : refraction and reflection

label the indicated numbers correctly

1,2 &3

Who developed a system for visually challenged people & published it in 1821

Answer explanation

Braille was developed in 1820's by louis braille and is most widely used by visually impaired people. a set of raised bumps or dots can be sensed with a finger in this braille system.

Why is a spectrum of seven colours formed when sunlight passes through a prism?

• A) White light is a mixture of seven colours.

• B) The different colours of light is reflected at different angles in a glass prism.

• C) The prism adds colour to the white sunlight.

• D) Light travels at high speed.