Human Eye And The Colourful World Grade 10

The colour VIOLET has:

• Maximum wavelength

• Minimum wavelength

• Average wavelength

• No wavelength

Which of the following is not part of formation of a rainbow?

• Dispersion

• Refraction

• Scattering

• Total internal reflection

The refractive index ________ while going towards the earth's surface.

• Increases

• Decreases

• Stays the same

• Becomes 0

Early sunrise and delayed sunset are due to:

• Refraction of light rays in water molecules

• Scattering of light

• Reflection of light

• Atmospheric refraction of light rays

The cause of hypermetropia is:

• Increase in focal length

• Decrease in focal length

• Excessive curvature of lens

• None of these

The part of the eye made up of collagen and elastic fiber is:

• Crystalline lens

• Sclera

• Cornea

• Aqueous humour

How many times does light get refracted in the eye before reaching the retina?

• 1

• 2

• 3

• 4

Answer explanation

Lights gets refracted in the cornea, aqueous humour, crystalline lens and vitreous humour before reaching the retina.

_____ detect the intensity (brightness) of light.

• Rods

• Cones

• Pons

• Optic nerves

The horizontal field view of ONE eye is:

• 180 degree

• 150 degree

• 120 degree

• 100 degree

Blind spot is the spot where _______ nerves leave the retina.

• Sensory

• Motor

• Relay

• Optic