LIGHT CLASS 8

_______ cell sense colours in retina

• Rods

• Cones

• Both a and b

• Optic nerve

In old age eyesight becomes foggy when it happens person is said to have __________

• Myopia

• Cataract

• Hypermetropia

• Short sight

Sensations felt by the nerve cells are transmitted to the brain through the _______

• Optic nerve

• Blind spot

• Nerve cell

• Rods

_________ controls the amount of light entering into the eye

• Cornea

• Pupil

• Iris

• Retina

Braille system has ____ dots patterns and characters

• 72

• 73

• 63

• 64

Splitting of light into its colours is known as ________ of light

• VIBGYOR

• Spectrum

• Rainbow

• Dispersion

__________ are used in submarines, tanks and also by soldiers in bunkers to see things outside

• Periscope

• Kaleidoscope

• Multiple images

• Dispersion

The comfortable distance at which a person can read is about ______

• 35m

• 35cm

• 25cm

• 25m

Lack of __________ in foodstuff is responsible for many eye troubles

• Vitamin B complex

• Vitamin D

• Vitamin C

• Vitamin A

An image formed by a mirror the left of the object appears on the right and the right appears on the left this is known as _________

• Lateral inversion

• Inverted image

• Virtual image