Refractive Index -Multiple Choice Questions Quiz

Interactive MCQs on “Refractive Index”:

Question 1: The refractive index of a medium is ___?

(a) The ratio of the speed of light in the medium to its speed in a vacuum
(b) The ratio of the speed of light in a vacuum to its speed in the medium
(c) The ratio of the speed of sound in the medium to its speed in a vacuum
(d) The ratio of the speed of sound in a vacuum to its speed in the medium

Question 2: The refractive index of a medium depends on__ ?

(a) The frequency of the light passing through it
(b) The wavelength of the light passing through it
(c) The angle of incidence of the light passing through it
(d) Both wavelength and frequency of the light passing through it

Question 3: The refractive index of a medium is highest for which color of light?

(a) Red
(b) Green
(c) Blue
(d) All colors have the same refractive index

Question 4: The refractive index of a material is a measure of?

(a) The amount of light absorbed by the material
(b) The amount of light reflected by the material
(c) The amount of light transmitted through the material
(d) The amount of bending of light as it passes through the material

Question 5: The refractive index of a material can be used to calculate ____?

(a) The angle of incidence of light passing through the material
(b) The angle of reflection of light passing through the material
(c) The critical angle of total internal reflection for the material
(d) The intensity of light passing through the material

Question 6: An object is placed in front of a converging lens with a focal length of 20 cm. If the image distance is 30 cm, what is the refractive index of the medium in which the lens is placed?

(a) 1.33
(b) 1.5
(c) 1.67
(d) 1.75

Question 7: A ray of light travels from air into a medium with a refractive index of 1.5. If the angle of incidence is 30 degrees, what is the angle of refraction?

(a) 15 degrees
(b) 22.5 degrees
(c) 30 degrees
(d) 45 degrees

Question 8: A glass plate has a thickness of 2 cm and a refractive index of 1.5. If a ray of light passes through the plate at an angle of 30 degrees to the normal, what is the displacement of the ray?

(a) 0.58 cm
(b) 0.87 cm
(c) 1.00 cm
(d) 1.17 cm

Question 9: A glass prism has a refractive index of 1.5 and an apex angle of 60 degrees. If a ray of light enters the prism at an angle of 45 degrees to the normal, what is the angle of deviation?

(a) 15 degrees
(b) 30 degrees
(c) 45 degrees
(d) 60 degrees

Question 10: A glass lens has a refractive index of 1.5 and a radius of curvature of 20 cm. If the lens is placed in water with a refractive index of 1.33, what is the new focal length of the lens?

(a) 16.5 cm
(b) 18.5 cm
(c) 20.0 cm
(d) 22.0 cm


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