# MCQ on Light (Optics) Test+Quiz

`[MCQ-1]` What is the relation between focal length (f) and radius of curvature (r) of a curve mirror?

A: f = 2r
B: f = r/2
C: f = r/3
D: f = 3r/2

f =2r

`[MCQ-2]` What is the focal length of a curve mirror is it has a radius of curvature is 40 cm.

A: 20 cm
B: 35 cm
C: 25 cm
D: 40 cm

20 cm

`[MCQ-3]` Which type of mirror used in the headlight of a motorcycle?

A: Concave mirror
B: Convex mirror
C: Flat mirror
D: none of the above

Concave mirror

`[MCQ-4]` Which type of mirror used in the dental clinic?

A: Concave mirror
B: Convex mirror
C: Flat mirror
D: None of the above

Concave mirror

`[MCQ-5] `If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?

A: r = v
B: r > v
C: r = 1/v
D: r < v

D: r < v

`[MCQ-6]` A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident on the mirror from this source and reflected from it is

A: 0
B: 180 degrees
C: 90 degrees
D: 360 degrees

B: 180 degrees

`[MCQ-7]` What kind of mirror is this?

A: Convex mirror
B: Concave mirror
C: Plano Concave
D: Concavo Convex

Concave mirror

`[MCQ-8]` In the above figure – 1, the point P represents —

A: Pole
B: Center of curvature
C: Focus point
D: None of these

Pole

`[MCQ-9]` In the above figure – 1, what the point f indicates?

A: Pole
B: Center of curvature
C: Focus point
D: None of these

Focus point

`[MCQ-10]` In the above figure – 1, the point C represents-

A: Pole
B: Center of curvature
C: Focus point
D: None of these

Center of Curvature

`[MCQ-11]` Which among the following figure is correct regarding the reflection of light by a concave mirror?

A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: None of the figure is correct

Figure 1 is correct

`[MCQ-12]` What kind of lense is the following figure given below?

A: Concave Lens
B: Plano-Concave Lens
C: Convex lens
D: Concevo-Convex Lens;

Convex Lens

`[MCQ-13]` Which of the following figure given below is correct?

A: Figure 1 is correct
B: Figure 2 is correct
C: Figure 3 is correct
D: Figure 4 is correct

Figure 1 is correct

`[MCQ-14]` In case of refraction, if the angle of incidence and the angle of refraction are 45 degrees and 30 degrees respectively, then the angle of deviation is

A: 75 o
B: 15o
C: 7.5o
D: 37.5o

B: 15o

`[MCQ-15]` Which of the following has the highest wavelength?

A: X-Ray
B: Gamma ray
C: infrared ray
D: ultraviolet ray

Infrared ray

`[MCQ-16]` To produce a real and magnified image by a convex lens, where should the object be placed? [f= focus; u= distance of the object from the lens]

A: f < u < 2f
B: u < 2f
C: u > 2f
D: u > f

A: f < u < 2f

`[MCQ-17]` If a refractive index of a medium is μ, and the velocity of a light in free space is c, then the velocity of light of that medium is

A: μc
B: (c/μ)1/2
C: (μc)1/2
D: c/μ

D: c/μ

`[MCQ-18]` When the light is passing from rarer to a denser medium, which is the correct statement?

A: Incident angle is equal to refracted angle
B: Incident angle is greater than refracted angle
C: Incident angle is less than refracted angle
D: Can not be determined

B: Incident angle is greater than refracted angle

`[MCQ-19]` Which physical quantity is remain constant in case refraction?

A: Wavelength of light
B: Frequency of light
D: Amplitude
E: All of the above

B: Frequency of light

`[MCQ-20]` In case of refraction, when the light passes from rarer to a denser medium, if the angle of incident is 65o and angle of refraction is 25o, then the deviation of angle would be-

A: 65o
B: 25o
C: 40o
D: 30o

C: 40o

`[MCQ-21]` The deviation of light ray when refracted by a parallel glass slab is –

A: 90 o
B: 0o
C: 45o
D: 180o

B: 0o

`[MCQ-22]` An object is placed at a distance u from a convex lens, and its image is formed at a distance v. What will be the formula of lateral magnification (m)?

A: m = uv
B: m = u/v
C: m= v/u
D: m= (u/v)1/2

C: m= v/u

`[MCQ-23]` What is the relation between the radius of curvature and the focal length of a mirror?

A: f = 3/r
B: f = r/3
C: f = 2r
D: f= r/2

D: f= r/2

`[MCQ-24]` The refractive index of a medium with respect to vacuum is

A: Always greater than one
B: Always less than one
C: Equal to one
D: none of the above

B: Always less than one.

`[MCQ-25]` Which color has the maximum deviation when white color refracted through a prism?

A: Red
B: Violet
C: Green
D: Yellow

B: Violet

`[MCQ-26]` What will be the refractive index of a medium when the velocity of light is 2 × 108 m/s?

A: 1
B: 1.2
C: 1.5
D: 1.7

C: 1.5

`[MCQ-27]` Which among the following electromagnetic wave the frequency is maximum?

A: Infrared
B: Ultraviolet
C: X-ray
D: Gama Ray

D: Gama Ray

`[MCQ-28]` What type of image will be formed if an object is placed between f and 2f in front of a convex lens?

A: Real and enlarged upright
B: Real and diminished
C: Virtual, enlarged and upright
D: Real, enlarged, inverted

D: Real, enlarged, inverted

`[MCQ-29]` For White light which color has the maximum refractive index?

A: Red
B: Yellow
C: Orange
D: Violet

D: Violet

`[MCQ-30]` What will be the angle of refraction for a ray of light fall perpendicular to the interface of two mediums?

A: 90o
B:0o
C: 180o
D: 45o

B: 0o

`[MCQ-31]` What will be the refractive index of a medium if a light ray falls normally on it?

A: One
B: one half
C: 3/2
D: infinity

D: Infinity

`[MCQ-32]` Snell’s law is valid for

A: Reflection of light
B: Refraction of light
C: Both A and B
D: None of A and B

B: Refraction of light

`[MCQ-33]` Let ∠i = angle of incidence, ∠r = angle of refraction, and μ = refractive angle. The correct formula for Snell”s law is –

A: μ = sin∠i × sin∠r
B: μ = sin∠i × cos∠r
C: μ = (sin∠i)/(sin∠r)
D: μ = (sin∠r)/(sin∠i)

C: μ = sin∠i/sin∠r

`[MCQ-34]` The color of light depends on

A: Wavelength
B: Frequency
C: Amplitude
D: All of the above

B: Frequency

`[MCQ-35]` Between red and violet, which color has more frequency?

A: Red has more frequency than violet
B: Violet has more frequency than red
C: Red and violet has the same frequency
D: Can not say

B: Violet has more frequency than red

`[MCQ-36]` Between red and violet, which color has greater wavelength?

A: Red has a greater wavelength than violet.
B: Violet has a greater wavelength than red.
C: Red and violet have the same wavelength.
D: Can not say

A: Red has a greater wavelength than violet.

`[MCQ-37]` Let frequency = n, wavelength = λ, and the velocity of light is c. Which relation among the following is correct?

A: c = nλ
B: c = n/λ
C: c = λ/n
D: c = n2

A: c = nλ

`[MCQ-38]` For which of the following color does a lens has maximum focal length?

A: Red
B: Yellow
C: Green
D: Violet

A: Red

`[MCQ-39]` For an object placed at the focus of a convex lens the image will be formed at

A: Focus
B: Optical center
C: Infinity
D: Twice the length of focus

Infinity

`[MCQ-40]` A convex mirror is used

A: by a dentist
B: for shaving
C: as a review mirror of a vehicle
D: as a light reflector for obtaining a parallel beam of light

C

`[MCQ-41]` Choose whether the statement is true or false: Focal length of a lens depends on its surrounding medium.

A: true
B: false

True

`[MCQ-42]` To obtain parallel ray from a point light source we use

A: both convex lens and concave mirror
B: both convex lens and convex mirror
C: both concave lens and concave mirror
D: both concave lens and convex mirror

A: both convex lens and concave mirror

`[MCQ-43]` What is the type of image form on the retina of our eyes?

A: Real and upright
B: Virtual and upright
C: Real and inverted
D: Virtual and inverted

Real and inverted

`[MCQ-44]` Which color is used as danger sign?

A: Green
B: Brown
C: Orange
D: Red

Red

`[MCQ-45]` For danger sign, red color is used, because

A: Scattering of red color is less due to large wavelength
B: Scattering of red color is less due to small wavelength
C: Scattering of red color is greater due to large wavelength
D: Scattering of red color is greater due to small wavelenth

A: Scattering of red color is less due to large wavelength

`[MCQ-46]` 4 different mediums P, Q, R and S have refractive index 1.5, 1.4, 1.8, and 1.3 respectively. In which medium the light has the maximum speed?

A: P medium
B: Q medium
C: R medium
D: S medium

S medium

`[MCQ-47]` Let μr and μv are the refractive indexes of a medium of red and violet color respectively. Then

A: μr > μv
B: μr < μv
C: μr = μv
D: None of the above

B: μr < μv

`[MCQ-48]` Focal length of a convex lens is 15 cm. For which distance an object is placed so that the lens acts as a magnifying glass?

A: Between 15 cm and 30 cm
B: Less than 15 cm
C: Greater than 30 cm
D: Exactly at 30 cm

B: Less than 15 cm

`[MCQ-49]` = deviation of prism, i1 = angle of incidence, i2 = angle of refraction of a prism. Which formula is correct?

A: = i1 + i2 − A
B: = i1 + i2 + A
C: = i1 − i2 + A
D: = (i1 + i2)/A

A

`[MCQ-50]` Deviation of light passing through the center of lens is

A: 0°
B: 45°
C: 90°
D: 180°

A: 0°

`[MCQ-51]` The split of white light into 7 colors by prism is known as

A: Diffraction
B: Dispersion
C: scattering
D: Polarization

B: Dispersion

`[MCQ-52]` What is the speed of light in free space?

A: 3.5 ×108 m/s
B: 3 ×108 m/s
C: 3 ×109 m/s
D: 3.5 ×109 m/s