Light - Practice Test | ExamPrepSheets

[#261] Fibre optics work on the principle of

(A) scattering of light

(B) total internal absorption

(C) total internal reflection

(D) optical rotation

Correct Answer

(C) total internal reflection

[#262] . . . . . . . . lenses are used by people suffering from myopia-

(A) cylindrical

(B) convex-concave

(C) concave

(D) convex

Correct Answer

(C) concave

[#263] One can distinguish a telescope from a microscope by observing

(A) length

(B) colour

(C) size of the lens

(D) length and size of the lens

Correct Answer

(D) length and size of the lens

[#264] Which one of the following statement is correct?

(A) The image formed by a concave mirror for an object lying at infinity is at the principal focus, highly diminished, real and inverted

(B) A ray of light parallel to the principal axis after reflection from a concave mirror appears to diverge from the principal focus of the mirror

(C) The focal length of a spherical mirror is double of its radius of curvature

(D) A ray of light travelling from a rarer medium to a denser medium bends away from the normal

Correct Answer

(A) The image formed by a concave mirror for an object lying at infinity is at the principal focus, highly diminished, real and inverted

[#265] Red' is used as a danger signal because

(A) blood is red

(B) red light is scattered least by the air molecule

(C) red colour is easily available

(D) red colour is soothing for eye

Correct Answer

(B) red light is scattered least by the air molecule

Light - Study Mode

[#261] Fibre optics work on the principle of

Correct Answer

[#262] . . . . . . . . lenses are used by people suffering from myopia-

Correct Answer

[#263] One can distinguish a telescope from a microscope by observing

Correct Answer

[#264] Which one of the following statement is correct?

Correct Answer

[#265] Red' is used as a danger signal because

Correct Answer