Pre Assessment| CBSE| G8| Light

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

• 30°

• 90°

• 45°

• 60°

Which of the following objects will result in regular reflection when a beam of light strikes?

• Mirror

• Cardboard surface

• Chalk powder

• Piece of paper

What is the angle of reflection when a beam of light is incident on a smooth, polished surface?

• Equal to the angle of incidence

• Depends on the surface color

• Less than the angle of incidence

• Greater than the angle of incidence

Which part of the eye controls the amount of light entering into the eye?

• Cornea

• Retina

• Lens

• Pupil

What is the purpose of a kaleidoscope?

• To magnify objects

• To reflect light

• To create multiple images

• To disperse light

What is the main function of cones in the eye?

• To protect the eye

• To control the amount of light

• To sense dim light

• To sense color

What is the purpose of the laws of reflection?

• To create illusions

• To confuse students

• To complicate experiments

• To explain how light behaves

What is the role of the iris in the eye?

• To focus light

• To detect color

• To control the amount of light entering the eye

• To form images

What is the purpose of the Braille system?

• To reflect light

• To create colorful patterns

• To disperse light

• To help visually impaired persons read and write

3.Which of the following can be used to form a real image ?

• a. Convex mirror

• b. Concave mirror

• c. Both concave and convex

• d. Plane mirror