Samacheer Kalvi Class 8 Science Light Questions - 1

Question: 1

The distance from the pole to the focus is called

(A) Pole length

(B) Principal axis

(C) Focal length

(D) None of the above

Question: 2

The refractive index of water is ______

(A) 1.0

(B) 1.33

(C) 1.44

(D) 1.52

Question: 3

The phenomenon of light passing through the object is called

(A) Refraction

(B) Reflection

(C) Total internal reflection

(D) Dispersion

Question: 4

Which surface will not reflect most of the light falling on them?

(A) Opaque surface

(B) Shining surface

(C) Smooth surface

(D) Rough surface

Question: 5

Mirrors having a curved reflecting surface are called as

(A) Simple mirrors

(B) Plane mirrors

(C) Spherical mirrors

(D) None of the above

Question: 6

The imaginary line passing through the centre of curvature and pole of a spherical mirror is called

(A) Principal axis

(B) Pole

(C) Radius of curvature

(D) Centre of curvature

Question: 7

Focal length is equal to half of the

(A) Axis

(B) Centre of curvature

(C) Radius of curvature

(D) None of the above

Question: 8

The ENT doctor uses a _____

(A) Convex lens

(B) Convex mirror

(C) Concave mirror

(D) Plane mirror

Question: 9

The spherical mirror used as a rear view mirror in the vehicle is _____

(A) Plane mirror

(B) Convex mirror

(C) Concave mirror

(D) None of the above

Question: 10

The spherical mirror with a reflecting surface curved inward is called _____

(A) Curved mirror

(B) Convex mirror

(C) Concave mirror

(D) None of the above