Light class 8

A smooth shining surface, which rebounds the light back in same or in different direction, is called

• Mirror

• Incident ray

• Lens

• Idealisation

Band of seven colours is called

• dispersion

• Normal

• spectrum

• VIBGYOR

Front balged part of the eyeball is called

• PUPIL

• CORNEA

• RETINA

• IRIS

Which one of the following statements is correct regarding rods and cones in the human eye?

• Cones are sensitive to dim light

• Cones are sensitive to bright light

• Rods can sense colour

• Rods are sensitive to bright light

Name the type of mirror used as a backview mirror.

• Convex mirror

• Plane mirror

• Concave mirror

• Any of these

The image formed by a camera and a simple microscope are respectively

• real and real

• real and virtual

• virtual and real

• virtual and virtual

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

• 60°

• 45°

• 180°

• 90°

• 160°

The defect due to which a person is not able to see the distant objects clearly:

• Myopia

• Cataract

• Hypermetropia

• Cornea

If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?

• 60°

• 30°

• 55°

• 40°

When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called

• mirage

• Up -side down phenomenon

• Left-right confusion

• Lateral inversion