Revision Class 8

Name a device which works on the reflection of reflected light.

• Kaleidoscope

• Periscope

Which option is not the law of reflection?

• The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane

• The angle of incidence and the angle of reflection are always equal

• Angle of reflection = normal

Which part of the eye helps to focus the image?

• Retina

• Iris

• Ciliary Muscle

• Eye Lens

How is hypermetropia corrected?

How many images can be formed when two mirrors are kept parallel to each other.

• 2

• Infinite

• 4

What is the persistence of vision.

• 1/16 of a second

• 1/14 of a second

• 1/15 of a second

• 1/19 of a second

Which part of the eye protects the interior from accidents? 

• Pupil

• Cornea

• Rods

• Retina

Image formed in a plane mirror undergoes ___________ Inversion.

• Lateral Inversion

• Upright

• Erect

_______ 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